It is shown by DEAE-cellulose chromatography, gel filtration on Sephadex G-200 and by density gradient ultracentrifugation that there are IgG isoantibodies in O sera, which can differentiate between A1 and A2 red cells quite well. From this it is concluded that the difference between A1 and A2 red cells must be qualitative.

This content is only available via PDF.
Copyright © 1972 by The American Association of Immunologists, Inc.
1972
The Williams & Wilkins Company