Representative N-glycan structures of ovalbumins from chicken (36-38) and pigeon (12, 13). Specificity of lectins (Con A, RCA-I, and GS-I) and anti-P1 mAb for the detection of oligosaccharides were also indicated. Monosaccharides were denoted as follows: M, mannose; GN, N-acetylglucosamine; G, galactose; NA, N-acetylneuraminic acid.