A Family with the Rare Red Cell Antigens Wra and ‘Super’ Sda

. A family is recorded in which the two rare antigens ‘super’ Sid, or ‘super’ Sda, and Wra are present. The linkage count between the two characters is six non-recombinants, for which the lod score at θ =0.00 is 1.806. This is tantalizingly suggestive of linkage, or possibly of control by one and the same complex locus, but does not reach a significant level. There is also a hint in the family of a possible relationship between the enzyme GPT (glutamic-pyruvic transaminase) and the ‘super’ Sda condition.