##gff-version 3 Q02603 UniProtKB Chain 1 626 . . . ID=PRO_0000057672;Note=Beta-galactosidase large subunit Q02603 UniProtKB Active site 466 466 . . . Note=Proton donor;Ontology_term=ECO:0000250;evidence=ECO:0000250 Q02603 UniProtKB Active site 534 534 . . . Note=Nucleophile;Ontology_term=ECO:0000250;evidence=ECO:0000250 Q02603 UniProtKB Site 318 318 . . . Note=Has an effect on thermostability;Ontology_term=ECO:0000255;evidence=ECO:0000255