The Land and Sea Dayaks of Sarawak were surveyed for several erythrocyte enzymes. The gene frequency of 6PGDC in 132 Land Dayaks and 127 Sea Dayaks were 0.045 and 0.047, respectively. The gene frequency of PGM1-1 IN 285 Land Dayks and 240 Sea Dayaks were 0.716 and 0.779, respectively. The ADA2 gene frequency in 283 Land Dayaks and 188 Sea Dayaks were 0.154 and 0.090. ADA 5-1 was found once in the Land Dayaks and once in the Sea Dayaks. AK 2-1 was found once in 221 Sea Dayaks but not in any of 270 Land Dayaks. No PHI, LDH or CA variants were found among the Land or Sea Dayaks.
Samples from 378 Chinese and 259 Malay blood donors in Singapore have been studied for electrophoretic variants in 13 red cell enzyme systems and for abnormal haemoglobins. Variants were detected in 8 of the enzyme systems, and the frequencies were polymorphic for acid phosphatase, 6 phosphogluconate dehydrogenase phosphoglucomutase (locus 1) among both Chinese and Malays, and for adenylate kinase also among Malays. Rare variants were detected in the phosphohexose, NADH diaphorase and lactate dehydrogenase systems. A new GPGD phenotype and three new LDH phenotypes have been described. Electrophoretic variants of haemoglobin were more frequent among Malays than among Chinese.