##gff-version 3 A3MXQ6 UniProtKB Propeptide 1 9 . . . ID=PRO_0000397402;Note=Removed in mature form%3B by autocatalysis;Ontology_term=ECO:0000255;evidence=ECO:0000255|HAMAP-Rule:MF_02113 A3MXQ6 UniProtKB Chain 10 203 . . . ID=PRO_0000397403;Note=Proteasome subunit beta 2 A3MXQ6 UniProtKB Active site 10 10 . . . Note=Nucleophile;Ontology_term=ECO:0000255;evidence=ECO:0000255|HAMAP-Rule:MF_02113