The association of Anek, Raddon and Lane antisera with the Miltenberger subsystem is discussed.

Two antisera are shown to detect a low frequency antigen in the British population that is MNSs-linked.

An immune antibody, made in response to transfusion, has revealed a new antigen (Wk^a) with a frequency of 0.3% among English blood donors, and 0.1% among K+ blood donors. The families of 5 K+ Wk(a+) propositi have no recombinants and 13 non-recombinants. The new antigen is shown to be part of the Kell blood group system.