A private red cell antigen, Jones, causing haemolytic disease of the newborn.

Two previously unpublished low-incidence antigens, Jones and Hol., are identical. The antigen is a dominant, autosomally inherited character that segregates independently from the loci for the ABO, MNS, Duffy and Yt blood group systems and is different from previously published infrequent antigens. The antigen is apparently unaffected by enzyme treatment and is well developed on red cells of neonates. The antibody reacts best by indirect antiglobulin testing, is IgG and has caused haemolytic disease of the newborn. This private blood group antigen, named Jones, has been assigned the ISBT number 700047.