The agglutinability of red blood cells of A(1), A(2), A(3), A(x) and cis-AB phenotypes
by several anti-A(1) reagents was quantitatively evaluated and found to correlate with
the number of A antigenic sites/cell determined by using 125 I-labelled IgG anti-A. Moreover,
anti-A(1) sera could be absorbed by some A(2) red blood cells and were inhibited by concentrated
saliva from A(2) secretor individuals. The significance of these findings is discussed
in the light of recent data from the literature.
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