Possible evidence for a new C-locus specificity: studies of the serum Pullium

We have presented data from our own experience and from the first serum exchange of the HLA Workshop of the Americas that indicate the serum Pul may identify a new low-frequency specificity of the C locus. One informative family has been studied, and the results are consistant with a C-locus inheritance pattern. No correlation was found with antisera that identify known antigens of the A, B, or C locus. One additional serum, also available for study, seems to react with the same specificity as the serum Pul.