By Winifred M. Watkins (auth.), Harry Harris, Kurt Hirschhorn (eds.)

ISBN-10: 1461582881

ISBN-13: 9781461582885

ISBN-10: 1461582903

ISBN-13: 9781461582908

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5 (Nagai et al. , 1978b). The isoelectric points of the B transferases in serum and ovarian cyst fluids from group Band AB individuals were determined by isoelectric focusing (Topping and Watkins, 1975). The major peaks of activity from both sources focused within the pH range 9-10. Kishi et at.

Removal of fucose destroyed the activity with anti-HI serum but left the inhibitory activity for the other anti-I sera unimpaired (Fig. 5). Removal of the terminal l3-galactosyl residues destroyed the reactivity of the glycolipids with six of the anti-I reagents, but with the remaining four sera the activity was unchanged or only slightly diminished. Finally. 3) Gal-(1-4)-GlcNAc- /6) Gal-(I- 4)-GlcNAc-(1 .. Anti-I sera (2nd category) • Anti-I sera (1st category) ~ .. Anti-HI sera Fig. 5. Tentative structure of I-antigen complex proposed by Gardas (I976h).

It was suggested that two repeating I3-Gal(l~4)GIcNAc residues and I3-GIcNAc(l~3)Gal residues might be essential for the full expression of activity. The glycosphingolipid was obtained by removal of sialic acid from a ganglioside isolated from bovine erythrocytes but the structure is identical with that of the H2-glycolipid (Table V) isolated from human red cell membranes except for the additional fucose residue in the H-active compound. It is thus feasible to suppose that this incomplete chain occurs on the human erythrocyte surface.

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Advances in Human Genetics 10 by Winifred M. Watkins (auth.), Harry Harris, Kurt Hirschhorn (eds.)

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