Ontology of Biological Attributes entry OBA_2040452 (level of alpha-1,4-N-acetylglucosaminyltransferase in blood serum) is the amount of a alpha-1,4-N-acetylglucosaminyltransferase when measured in blood serum. Also known as: blood serum alpha-1,4-N-acetylglucosaminyltransferase amount.