level of alpha-1,3-mannosyl-glycoprotein 4-beta-N-acetylglucosaminyltransferase A in blood serum (OBA_2042359) is the amount of a alpha-1,3-mannosyl-glycoprotein 4-beta-N-acetylglucosaminyltransferase A when measured in blood serum. Also known as: blood serum alpha-1,3-mannosyl-glycoprotein 4-beta-N-acetylglucosaminyltransferase A amount.