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UniProtKB - Q8MSU3 (FRRS1_DROME)

Entry version 130 (25 May 2022)
Sequence version 1 (01 Oct 2002)
Previous versions | rss
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Protein

Putative ferric-chelate reductase 1 homolog

Gene

CG8399

Organism
Drosophila melanogaster (Fruit fly)
Status
Reviewed-Annotation score:

Annotation score:4 out of 5

<p>The annotation score provides a heuristic measure of the annotation content of a UniProtKB entry or proteome. This score <strong>cannot</strong> be used as a measure of the accuracy of the annotation as we cannot define the 'correct annotation' for any given protein.<p><a href='/help/annotation_score' target='_top'>More...</a></p>-Experimental evidence at transcript leveli <p>This indicates the type of evidence that supports the existence of the protein. Note that the 'protein existence' evidence does not give information on the accuracy or correctness of the sequence(s) displayed.<p><a href='/help/protein_existence' target='_top'>More...</a></p>

<p>This section provides any useful information about the protein, mostly biological knowledge.<p><a href='/help/function_section' target='_top'>More...</a></p>Functioni

Putative ferric-chelate reductases reduce Fe3+ to Fe2+ before its transport from the endosome to the cytoplasm.

1 Publication

Caution

The cytochrome b561 domain lacks the conserved His residue that binds iron in the heme. The reductase activity is therefore unsure in vivo.Curated

<p>This subsection of the 'Function' section provides information relevant to cofactors. A cofactor is any non-protein substance required for a protein to be catalytically active. Some cofactors are inorganic, such as the metal atoms zinc, iron, and copper in various oxidation states. Others, such as most vitamins, are organic.<p><a href='/help/cofactor' target='_top'>More...</a></p>Cofactori

heme bBy similarityNote: Binds 2 heme b groups non-covalently.By similarity

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/function%5Fsection">Function</a> section indicates at which position the protein binds a given metal ion. The nature of the metal is indicated in the 'Description' field.<p><a href='/help/metal' target='_top'>More...</a></p>Metal bindingi409Iron 1 (heme b 1 axial ligand); via tele nitrogenBy similarity1
Metal bindingi450Iron 2 (heme b 2 axial ligand); via tele nitrogenBy similarity1
Metal bindingi480Iron 1 (heme b 1 axial ligand); via tele nitrogenBy similarity1
Metal bindingi516Iron 2 (heme b 2 axial ligand); via tele nitrogenBy similarity1

<p>The <a href="http://www.geneontology.org/">Gene Ontology (GO)</a> project provides a set of hierarchical controlled vocabulary split into 3 categories:<p><a href='/help/gene_ontology' target='_top'>More...</a></p>GO - Molecular functioni

Complete GO annotation on QuickGO ...

GO - Biological processi

Complete GO annotation on QuickGO ...

<p>UniProtKB Keywords constitute a <a href="http://www.uniprot.org/keywords">controlled vocabulary</a> with a hierarchical structure. Keywords summarise the content of a UniProtKB entry and facilitate the search for proteins of interest.<p><a href='/help/keywords' target='_top'>More...</a></p>Keywordsi

Molecular functionOxidoreductase
Biological processElectron transport, Transport
LigandIron, Metal-binding

Protein family/group databases

Transport Classification Database

More...TCDBi		5.B.2.2.3, the eukaryotic cytochrome b561 (cytb561) family

<p>This section provides information about the protein and gene name(s) and synonym(s) and about the organism that is the source of the protein sequence.<p><a href='/help/names_and_taxonomy_section' target='_top'>More...</a></p>Names & Taxonomyi

<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section provides an exhaustive list of all names of the protein, from commonly used to obsolete, to allow unambiguous identification of a protein.<p><a href='/help/protein_names' target='_top'>More...</a></p>Protein namesi
Recommended name:
Putative ferric-chelate reductase 1 homolog (EC:1.-.-.-)
Short name:
DmSDR2
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section indicates the name(s) of the gene(s) that code for the protein sequence(s) described in the entry. Four distinct tokens exist: 'Name', 'Synonyms', 'Ordered locus names' and 'ORF names'.<p><a href='/help/gene_name' target='_top'>More...</a></p>Gene namesi
ORF Names:CG8399
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section provides information on the name(s) of the organism that is the source of the protein sequence.<p><a href='/help/organism-name' target='_top'>More...</a></p>OrganismiDrosophila melanogaster (Fruit fly)
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section shows the unique identifier assigned by the NCBI to the source organism of the protein. This is known as the 'taxonomic identifier' or 'taxid'.<p><a href='/help/taxonomic_identifier' target='_top'>More...</a></p>Taxonomic identifieri7227 [NCBI]
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section contains the taxonomic hierarchical classification lineage of the source organism. It lists the nodes as they appear top-down in the taxonomic tree, with the more general grouping listed first.<p><a href='/help/taxonomic_lineage' target='_top'>More...</a></p>Taxonomic lineageiEukaryota › Metazoa › Ecdysozoa › Arthropoda › Hexapoda › Insecta › Pterygota › Neoptera › Endopterygota › Diptera › Brachycera › Muscomorpha › Ephydroidea › Drosophilidae › Drosophila › Sophophora ›
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section is present for entries that are part of a <a href="http://www.uniprot.org/proteomes">proteome</a>, i.e. of a set of proteins thought to be expressed by organisms whose genomes have been completely sequenced.<p><a href='/help/proteomes_manual' target='_top'>More...</a></p>Proteomesi
  • UP000000803 <p>A UniProt <a href="http://www.uniprot.org/manual/proteomes%5Fmanual">proteome</a> can consist of several components.<br></br>The component name refers to the genomic component encoding a set of proteins.<p><a href='/help/proteome_component' target='_top'>More...</a></p> Componenti: Chromosome 2R

Organism-specific databases

Drosophila genome database

More...FlyBasei		FBgn0034067, CG8399

Eukaryotic Pathogen, Vector and Host Database Resources

More...VEuPathDBi		VectorBase:FBgn0034067

<p>This section provides information on the location and the topology of the mature protein in the cell.<p><a href='/help/subcellular_location_section' target='_top'>More...</a></p>Subcellular locationi

Topology

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/subcellular%5Flocation%5Fsection">'Subcellular location'</a> section describes the extent of a membrane-spanning region of the protein. It denotes the presence of both alpha-helical transmembrane regions and the membrane spanning regions of beta-barrel transmembrane proteins.<p><a href='/help/transmem' target='_top'>More...</a></p>Transmembranei10 – 30Helical; Name=1Sequence analysisAdd BLAST21
Transmembranei408 – 428Helical; Name=2Sequence analysisAdd BLAST21
Transmembranei452 – 472Helical; Name=3Sequence analysisAdd BLAST21
Transmembranei480 – 500Helical; Name=4Sequence analysisAdd BLAST21
Transmembranei515 – 535Helical; Name=5Sequence analysisAdd BLAST21
Transmembranei548 – 568Helical; Name=6Sequence analysisAdd BLAST21
Transmembranei616 – 636Helical; Name=7Sequence analysisAdd BLAST21

Keywords - Cellular componenti

Membrane

<p>This section describes post-translational modifications (PTMs) and/or processing events.<p><a href='/help/ptm_processing_section' target='_top'>More...</a></p>PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the 'PTM / Processing' section describes the extent of a polypeptide chain in the mature protein following processing or proteolytic cleavage.<p><a href='/help/chain' target='_top'>More...</a></p>ChainiPRO_00003148471 – 647Putative ferric-chelate reductase 1 homologAdd BLAST647

Amino acid modifications

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/ptm%5Fprocessing%5Fsection">PTM / Processing</a> section specifies the position and type of each covalently attached glycan group (mono-, di-, or polysaccharide).<p><a href='/help/carbohyd' target='_top'>More...</a></p>Glycosylationi127N-linked (GlcNAc...) asparagineSequence analysis1
Glycosylationi158N-linked (GlcNAc...) asparagineSequence analysis1

Keywords - PTMi

Glycoprotein

Proteomic databases

PaxDb, a database of protein abundance averages across all three domains of life

More...PaxDbi		Q8MSU3

PRoteomics IDEntifications database

More...PRIDEi		Q8MSU3

PTM databases

GlyGen: Computational and Informatics Resources for Glycoscience

More...GlyGeni		Q8MSU3, 2 sites

SwissPalm database of S-palmitoylation events

More...SwissPalmi		Q8MSU3

<p>This section provides information on the expression of a gene at the mRNA or protein level in cells or in tissues of multicellular organisms.<p><a href='/help/expression_section' target='_top'>More...</a></p>Expressioni

Gene expression databases

Bgee dataBase for Gene Expression Evolution

More...Bgeei		FBgn0034067, Expressed in second segment of antenna (Drosophila) and 35 other tissues

ExpressionAtlas, Differential and Baseline Expression

More...ExpressionAtlasi		Q8MSU3, baseline and differential

Genevisible search portal to normalized and curated expression data from Genevestigator

More...Genevisiblei		Q8MSU3, DM

<p>This section provides information on the quaternary structure of a protein and on interaction(s) with other proteins or protein complexes.<p><a href='/help/interaction_section' target='_top'>More...</a></p>Interactioni

Protein-protein interaction databases

STRING: functional protein association networks

More...STRINGi		7227.FBpp0086349

<p>This section provides information on the tertiary and secondary structure of a protein.<p><a href='/help/structure_section' target='_top'>More...</a></p>Structurei

3D structure databases

AlphaFold Protein Structure Database

More...AlphaFoldDBi		Q8MSU3

SWISS-MODEL Repository - a database of annotated 3D protein structure models

More...SMRi		Q8MSU3

Database of comparative protein structure models

More...ModBasei		Search...

<p>This section provides information on sequence similarities with other proteins and the domain(s) present in a protein.<p><a href='/help/family_and_domains_section' target='_top'>More...</a></p>Family & Domainsi

Domains and Repeats

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/family%5Fand%5Fdomains%5Fsection">Family and Domains</a> section describes the position and type of a domain, which is defined as a specific combination of secondary structures organized into a characteristic three-dimensional structure or fold.<p><a href='/help/domain' target='_top'>More...</a></p>Domaini25 – 195ReelinPROSITE-ProRule annotationAdd BLAST171
Domaini245 – 368DOMONPROSITE-ProRule annotationAdd BLAST124
Domaini372 – 570Cytochrome b561PROSITE-ProRule annotationAdd BLAST199

<p>This subsection of the 'Family and domains' section provides information about the sequence similarity with other proteins.<p><a href='/help/sequence_similarities' target='_top'>More...</a></p>Sequence similaritiesi

Belongs to the FRRS1 family.Curated

Keywords - Domaini

Transmembrane, Transmembrane helix

Phylogenomic databases

evolutionary genealogy of genes: Non-supervised Orthologous Groups

More...eggNOGi		KOG4293, Eukaryota

Ensembl GeneTree

More...GeneTreei		ENSGT00940000170494

The HOGENOM Database of Homologous Genes from Fully Sequenced Organisms

More...HOGENOMi		CLU_028305_0_0_1

InParanoid: Eukaryotic Ortholog Groups

More...InParanoidi		Q8MSU3

Identification of Orthologs from Complete Genome Data

More...OMAi		PLTMRSW

Database for complete collections of gene phylogenies

More...PhylomeDBi		Q8MSU3

Family and domain databases

Conserved Domains Database

More...CDDi		cd08544, Reeler, 1 hit

Gene3D Structural and Functional Annotation of Protein Families

More...Gene3Di		2.60.40.4060, 1 hit

Integrated resource of protein families, domains and functional sites

More...InterProi		View protein in InterPro
IPR006593, Cyt_b561/ferric_Rdtase_TM
IPR005018, DOMON_domain
IPR002861, Reeler_dom
IPR042307, Reeler_sf

Pfam protein domain database

More...Pfami		View protein in Pfam
PF02014, Reeler, 1 hit

Simple Modular Architecture Research Tool; a protein domain database

More...SMARTi		View protein in SMART
SM00665, B561, 1 hit
SM00664, DoH, 1 hit

PROSITE; a protein domain and family database

More...PROSITEi		View protein in PROSITE
PS50939, CYTOCHROME_B561, 1 hit
PS50836, DOMON, 1 hit
PS51019, REELIN, 1 hit

<p>This section displays by default the canonical protein sequence and upon request all isoforms described in the entry. It also includes information pertinent to the sequence(s), including <a href="http://www.uniprot.org/help/sequence%5Flength">length</a> and <a href="http://www.uniprot.org/help/sequences">molecular weight</a>. The information is filed in different subsections. The current subsections and their content are listed below:<p><a href='/help/sequences_section' target='_top'>More...</a></p>Sequence (1+)i

<p>This subsection of the <a href="http://www.uniprot.org/help/sequences%5Fsection">Sequence</a> section indicates if the <a href="http://www.uniprot.org/help/canonical%5Fand%5Fisoforms">canonical sequence</a> displayed by default in the entry is complete or not.<p><a href='/help/sequence_status' target='_top'>More...</a></p>Sequence statusi: Complete.

This entry has 1 described isoform and 1 potential isoform that is computationally mapped.Show allAlign All

Q8MSU3-1 [UniParc]FASTAAdd to basket
« Hide
        10         20         30         40         50
MMQALTMRSW LATLVTALLA VAIWPDPGQS LPQGAPETVC DTMLPFHSGG 
        60         70         80         90        100
SVLPQNSVSP FSVETSSSTL GQGQTLRVDL TGVPAGLSFG GYMIQARNRN 
       110        120        130        140        150
PPHQIIGQFG PARDGTIKLM NCENSVNNSA THSNAGPKQQ VILEWQSPVD 
       160        170        180        190        200
FLGQVVFNAT IAQSYNEFWV GVPSQPVQIV RRDLSAAPPL PTQSPSAPAG 
       210        220        230        240        250
TTRAPYVPPS YVAPNNVVAV SSDPIYNGCG QSKNCFGFPD GCVATKSCTS 
       260        270        280        290        300
ITVVTVRGDV FEFEIQSGKG TNAAYVAVGL SDDAKMGDDL TTECVPENGR 
       310        320        330        340        350
VNLYSSLTSA SPYSAVRSNV NQNSARLLDA SIVDGVIYCR VQRDAVTNVQ 
       360        370        380        390        400
GRTFDLRNGK YHLLVASGSS LKENSVGYHD IGRLPSAQPI NLAEVQDLSG 
       410        420        430        440        450
SSRLLIQLHG AFMIAAWIGT TSLGIIFARY FKQTWVGSQS CGTDQWFAWH 
       460        470        480        490        500
RLLMVTTWSL TVAAYVLIWV ELKQAVWHAH SIIGLITVIL CFIQPIGALF 
       510        520        530        540        550
RPGPNDKKRP YFNWGHWLGG NLAHILGIVT IFFSVKLPKA ELPEWMDWIL 
       560        570        580        590        600
VSFVVVHVLV HLIFSIGGMA SERHLSQRAN TFQMGDMSHH QQHAMRNGMS 
       610        620        630        640 
MERKMDAPYA GMRKGLLGVY GVVLILFVTV LILLVVLAPI EQFLGKS
Length:647
Mass (Da):70,285
Last modified:October 1, 2002 - v1
<p>The checksum is a form of redundancy check that is calculated from the sequence. It is useful for tracking sequence updates.</p> <p>It should be noted that while, in theory, two different sequences could have the same checksum value, the likelihood that this would happen is extremely low.</p> <p>However UniProtKB may contain entries with identical sequences in case of multiple genes (paralogs).</p> <p>The checksum is computed as the sequence 64-bit Cyclic Redundancy Check value (CRC64) using the generator polynomial: x<sup>64</sup> + x<sup>4</sup> + x<sup>3</sup> + x + 1. The algorithm is described in the ISO 3309 standard. </p> <p class="publication">Press W.H., Flannery B.P., Teukolsky S.A. and Vetterling W.T.<br /> <strong>Cyclic redundancy and other checksums</strong><br /> <a href="http://www.nrbook.com/b/bookcpdf.php">Numerical recipes in C 2nd ed., pp896-902, Cambridge University Press (1993)</a>)</p> Checksum:iBBBDD090AFDF301D
GO

<p>In eukaryotic reference proteomes, unreviewed entries that are likely to belong to the same gene are computationally mapped, based on gene identifiers from Ensembl, EnsemblGenomes and model organism databases.<p><a href='/help/gene_centric_isoform_mapping' target='_top'>More...</a></p>Computationally mapped potential isoform sequencesi

There is 1 potential isoform mapped to this entry.BLASTAlignShow allAdd to basket
EntryEntry nameProtein names
Gene namesLengthAnnotation
A0A0B4LGL5A0A0B4LGL5_DROME
Uncharacterized protein, isoform B
sdr2 anon-EST:ParkEST009, Dmel\CG8399, SDR2, CG8399, Dmel_CG8399
656Annotation score:

Annotation score:2 out of 5

<p>The annotation score provides a heuristic measure of the annotation content of a UniProtKB entry or proteome. This score <strong>cannot</strong> be used as a measure of the accuracy of the annotation as we cannot define the 'correct annotation' for any given protein.<p><a href='/help/annotation_score' target='_top'>More...</a></p>

Sequence databases

Select the link destinations:

EMBL nucleotide sequence database

More...EMBLi

GenBank nucleotide sequence database

More...GenBanki

DNA Data Bank of Japan; a nucleotide sequence database

More...DDBJi
Links Updated
AE013599 Genomic DNA Translation: AAF58074.2
AY118595 mRNA Translation: AAM49964.1

NCBI Reference Sequences

More...RefSeqi		NP_611079.2, NM_137235.3

Genome annotation databases

Ensembl metazoan genome annotation project

More...EnsemblMetazoai		FBtr0087207; FBpp0086349; FBgn0034067

Database of genes from NCBI RefSeq genomes

More...GeneIDi		36768

KEGG: Kyoto Encyclopedia of Genes and Genomes

More...KEGGi		dme:Dmel_CG8399

UCSC genome browser

More...UCSCi		CG8399-RA, d. melanogaster

<p>This section provides links to proteins that are similar to the protein sequence(s) described in this entry at different levels of sequence identity thresholds (100%, 90% and 50%) based on their membership in UniProt Reference Clusters (<a href="http://www.uniprot.org/help/uniref">UniRef</a>).<p><a href='/help/similar_proteins_section' target='_top'>More...</a></p>Similar proteinsi

<p>This section is used to point to information related to entries and found in data collections other than UniProtKB.<p><a href='/help/cross_references_section' target='_top'>More...</a></p>Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AE013599 Genomic DNA Translation: AAF58074.2
AY118595 mRNA Translation: AAM49964.1
RefSeqiNP_611079.2, NM_137235.3

3D structure databases

AlphaFoldDBiQ8MSU3
SMRiQ8MSU3
ModBaseiSearch...

Protein-protein interaction databases

STRINGi7227.FBpp0086349

Protein family/group databases

TCDBi5.B.2.2.3, the eukaryotic cytochrome b561 (cytb561) family

PTM databases

GlyGeniQ8MSU3, 2 sites
SwissPalmiQ8MSU3

Proteomic databases

PaxDbiQ8MSU3
PRIDEiQ8MSU3

Protocols and materials databases

The DNASU plasmid repository

More...DNASUi		36768

Genome annotation databases

EnsemblMetazoaiFBtr0087207; FBpp0086349; FBgn0034067
GeneIDi36768
KEGGidme:Dmel_CG8399
UCSCiCG8399-RA, d. melanogaster

Organism-specific databases

FlyBaseiFBgn0034067, CG8399
VEuPathDBiVectorBase:FBgn0034067

Phylogenomic databases

eggNOGiKOG4293, Eukaryota
GeneTreeiENSGT00940000170494
HOGENOMiCLU_028305_0_0_1
InParanoidiQ8MSU3
OMAiPLTMRSW
PhylomeDBiQ8MSU3

Miscellaneous databases

BioGRID ORCS database of CRISPR phenotype screens

More...BioGRID-ORCSi		36768, 0 hits in 1 CRISPR screen

Database of phenotypes from RNA interference screens in Drosophila and Homo sapiens

More...GenomeRNAii		36768

Protein Ontology

More...PROi		PR:Q8MSU3

Gene expression databases

BgeeiFBgn0034067, Expressed in second segment of antenna (Drosophila) and 35 other tissues
ExpressionAtlasiQ8MSU3, baseline and differential
GenevisibleiQ8MSU3, DM

Family and domain databases

CDDicd08544, Reeler, 1 hit
Gene3Di2.60.40.4060, 1 hit
InterProiView protein in InterPro
IPR006593, Cyt_b561/ferric_Rdtase_TM
IPR005018, DOMON_domain
IPR002861, Reeler_dom
IPR042307, Reeler_sf
PfamiView protein in Pfam
PF02014, Reeler, 1 hit
SMARTiView protein in SMART
SM00665, B561, 1 hit
SM00664, DoH, 1 hit
PROSITEiView protein in PROSITE
PS50939, CYTOCHROME_B561, 1 hit
PS50836, DOMON, 1 hit
PS51019, REELIN, 1 hit

MobiDB: a database of protein disorder and mobility annotations

More...MobiDBi		Search...

<p>This section provides general information on the entry.<p><a href='/help/entry_information_section' target='_top'>More...</a></p>Entry informationi

<p>This subsection of the 'Entry information' section provides a mnemonic identifier for a UniProtKB entry, but it is not a stable identifier. Each reviewed entry is assigned a unique entry name upon integration into UniProtKB/Swiss-Prot.<p><a href='/help/entry_name' target='_top'>More...</a></p>Entry nameiFRRS1_DROME
<p>This subsection of the 'Entry information' section provides one or more accession number(s). These are stable identifiers and should be used to cite UniProtKB entries. Upon integration into UniProtKB, each entry is assigned a unique accession number, which is called 'Primary (citable) accession number'.<p><a href='/help/accession_numbers' target='_top'>More...</a></p>AccessioniPrimary (citable) accession number: Q8MSU3
Secondary accession number(s): Q9V7I1
<p>This subsection of the 'Entry information' section shows the date of integration of the entry into UniProtKB, the date of the last sequence update and the date of the last annotation modification ('Last modified'). The version number for both the entry and the <a href="http://www.uniprot.org/help/canonical%5Fand%5Fisoforms">canonical sequence</a> are also displayed.<p><a href='/help/entry_history' target='_top'>More...</a></p>Entry historyiIntegrated into UniProtKB/Swiss-Prot: January 15, 2008
Last sequence update: October 1, 2002
Last modified: May 25, 2022
This is version 130 of the entry and version 1 of the sequence. See complete history.
<p>This subsection of the 'Entry information' section indicates whether the entry has been manually annotated and reviewed by UniProtKB curators or not, in other words, if the entry belongs to the Swiss-Prot section of UniProtKB (<strong>reviewed</strong>) or to the computer-annotated TrEMBL section (<strong>unreviewed</strong>).<p><a href='/help/entry_status' target='_top'>More...</a></p>Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programDrosophila annotation project

<p>This section contains any relevant information that doesn't fit in any other defined sections<p><a href='/help/miscellaneous_section' target='_top'>More...</a></p>Miscellaneousi

Keywords - Technical termi

Reference proteome

Documents

  1. Drosophila
    Drosophila: entries, gene names and cross-references to FlyBase
  2. SIMILARITY comments
    Index of protein domains and families
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