The blood of 347 Indonesians and 88 Indonesian-Chinese was examined for erythrocyte phosphoglucomutase by starch gel electrophoresis followed by specific staining. The gene frequencies in the Indonesian group were PGM1 0.765, PGM2 0.232, PGMβ 0.0014, and PGM7 0.0014. In the Indonesian-Chinese-group they were: PGM1 0.761, PGM2 0.216, PGM6 0.0114, and PGM7 0.0114. In 357 Indonesians and 87 Indonesian-Chinese examined for carbonic anhydrase, the variant CA Ic was found twice in Indonesians, none in Indonesian-Chinese. There were no proven genetic abnormalities in the catalase electrophoretic pattern, but a change in electrophoretic mobility due to artificial factors was observed several times