Immunogen sequence: TLPSSVRIYL HGRQLSVSRH EAFPLRVIDS GTSDFALSNR YMQVWFSGLT GLLKSIRRVD EEHEQQVDMQ VLVYGTRTSK D. Catalyzes the first committed step in the biosynthesis of complex N-glycans. It controls conversion of high mannose to complex N-glycans; the f