Glycophorin A-deficient red cells may have a weak expression of C4-bound Ch and Rg antigens
Tippett, P., Storry, J.R., Walker, P.S., Okubo, Y., Reid, M.E.
En(a–) phenotype in a Japanese blood donor
Okubo, Y., Seno, T., Yamaguchi, H., Miyata, Y., Green, C.A., Daniels, G.L.