Anti-A1 is nice and cheap.
The most common classifications are A1 and A2. These account for over 99% of group A bloods. Of this 99%, A1 comprises approximately 80%. Commercial anti-A typing serum does not differentiate between A1 and A2 cells. A1 cells contain "A" antigen and "A1" antigen. A2 is not really a unique antigen. It is thought to be simply "A" antigen with no "A1" antigen. Several preparations are available that will react with A1 cells, but not other subgroups of A. An extract of the seeds of the plant, Dolichos biflorus has specific anti-A1 activity. "Absorbed anti-A" serum can also be prepared.
Product application: Anti-a1 antibody was detected in the serum of one of the rabbits. The anti-a1 auto-antibody reacted with the same amount of a1 IgG as did a conventional anti-a1 allo-antibody.
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