Further Investigation of the Colton Blood Croup in the Japanese: A Low Co^b Frequency and its Independence from the Diego Blood Group

Abstract

In testing additional 4, 000 blood samples from unrelated Japanese in and around Tokyo 18 (0.45%) were found to be phenotype Co(a+b+), from which the allele frequencies were estimated at Coa : 0.998 and Cob: 0.002. It was confirmed that the Cob frequency in the Japanese is lower by far than in Caucasians. In a family study, independent segregation of the Colton from the Diego blood group system was shown.