Properties of Caucasian Type Red Cell Acid Phosphatase Phenotypes CA and CB Found in Japanese

Properties of very rare phenotypes of red cell acid phosphatase in Japanese, CA and CB, were examined and compared with those of phenotypes A, BA and B. The relative activities of enzyme assayed by using p-nitrophenyl phosphate or 4-methyl-umbelliferyl phosphate were in the order of A<BA<B<CA<CB. The thermal stabilities examined at 48°C and 52°C were also in the order of A<BA<B<CA