A molecular function exhibited by a protein that is covalently attached (AKA tagged or conjugated) to another molecule (for example a protein or a lipid) where it acts as a marker, recognized by the cellular apparatus to target the tagged protein for some cellular process such as modification, sequestration, transport or degradation. [PMID:17632063]
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M5: Ontology GO: Gene Ontology GO:MF: GO Molecular Function