Fig. 1. Core glycans added on protein nascent chains. (A) The complete oligosaccharide is composed of two N-acetylglucosamine residues (black squares), nine mannose residues (green circles), and three glucose residues (red triangles). Linkages are shown and the three N-glycan branches are labeled A,B and C. (B) The absence of Dol-P-Man in the B3F7 cell line results in the transfer of a precursor structure missing four of the nine mannose residues but retaining the
1,2-mannose A.