2.4.1.142 chitobiosyldiphosphodolichol beta-mannosyltransferase; guanosine diphosphomannose-dolichol diphosphochitobiose mannosyltransferase; GDP-mannose-dolichol diphosphochitobiose mannosyltransferase; GDP-mannose:chitobiosyldiphosphodolichol beta-D-mannosy • • •