go_id,ontology,go_term,term_definition,evidence GO:0000287,MF,"magnesium ion binding","Interacting selectively and non-covalently with magnesium (Mg) ions.",IDA GO:0016266,BP,"O-glycan processing","The stepwise addition of carbohydrate or carbohydrate derivative residues to the initially added O-linked residue (usually GalNAc) to form a core O-glycan structure.",TAS GO:0030145,MF,"manganese ion binding","Interacting selectively and non-covalently with manganese (Mn) ions.",IEA GO:0030176,CC,"integral component of endoplasmic reticulum membrane","The component of the endoplasmic reticulum membrane consisting of the gene products and protein complexes having at least some part of their peptide sequence embedded in the hydrophobic region of the membrane.",IBA GO:0035252,MF,"UDP-xylosyltransferase activity","Catalysis of the transfer of a xylosyl group from UDP-xylose to an acceptor molecule.",TAS