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Could also form homooligomeric complexes (PubMed:10679296). Interacts with NDST1 (PubMed:18337501, PubMed:35137078). Interacts with GALNT5 (PubMed:10545594)"}],"commentType":"SUBUNIT"},{"commentType":"INTERACTION","interactions":[{"interactantOne":{"uniProtKBAccession":"Q93063","intActId":"EBI-1047761"},"interactantTwo":{"uniProtKBAccession":"Q16394","geneName":"EXT1","intActId":"EBI-1046007"},"numberOfExperiments":10,"organismDiffer":false}]},{"commentType":"SUBCELLULAR LOCATION","note":{"texts":[{"evidences":[{"evidenceCode":"ECO:0000269","source":"PubMed","id":"10679296"}],"value":"The active heparan sulfate polymerase complex composed of EXT1 and EXT2 is localized to the Golgi apparatus. 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