Previous examples of a very weak form of the antigen A have been described by Weiner, Sanger and Race (1959) and by Moore, Newstead and Johnson (1961). These phenotypes did not fit the categories of A, (Race, 1957), A,,, (Weiner et al. 1957), or A,, and were left unnamed for future christening. A second family in which a similar phenotype is inheritedapparently as a dominant effectis reported here. ResultsThe family tree is shown in figure 1. L. R. (11-3), the propositus is a healthy blood donor who has never had a transfusion. His sister (11-2) and one son (111-1) have an A antigen with similar characteristics. The other members of the family have blood groups with normal serological properties.(1) Agglutination Tests. (a) The anti-A and anti-A+B sera from stimulated donors that were used to test the cells of J. A. [l] were also

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