high-mannose-oligosaccharide beta-1,4-N-acetylglucosaminyltransferase; uridine diphosphoacetylglucosamine-oligosaccharide acetylglucosaminyltransferase; acetylglucosamine-oligosaccharide acetylglucosaminyltransferase; UDP-GlcNAc:oligosaccharide beta • • •