Another Kell-Related Antibody, Anti-K19

Abstract
A new, high-frequency antigen related to the Kell system was defined by the serum of a patient. The antigen was lacking from her cells and those of 1 of her 3 siblings. All random cells tested were incompatible with her serum, as were bloods of other various null phenotypes, but Ko bloods were compatible, suggesting that the antibody, subsequently called anti-K19, and related to the Kell blood group system.