Polymorphism of γ-aminobutyric acid transaminase (GABAT) was investigated in a total of 75 liver samples from unrelated Japanese using a orizontal starch gel electrophoresis. Three common phenotypes were observed, which corresponded to GABAT 1, GABAT 2-1, and GABAT 2, controlled by two alleles, GABAT1 andGABAT2. The estimated allele frequencies of GABAT1 and GABAT2 were 0.547 and 0.453, respectivly. This result was not significantly differerent of European samples reported by JEREMIAH and POVEY (1981).
