“…1). However, if this is the case, the A and B antigens of the family have dif ferent characteristics from the well-docu mented cases we found in the literature [5,14,15,18]. All of them, as well as the Japa nese families referred to by Race and Sanger [16], have weak B antigens and some anti-B activity in their sera, which is not the case with this infant's mother.…”