level of beta-1,4-mannosyl-glycoprotein 4-beta-N-acetylglucosaminyltransferase in blood serum (OBA_2042358) is the amount of a beta-1,4-mannosyl-glycoprotein 4-beta-N-acetylglucosaminyltransferase when measured in blood serum. Also known as: blood serum beta-1,4-mannosyl-glycoprotein 4-beta-N-acetylglucosaminyltransferase amount.