Phenotypic distributions of red cell glutamate-pyruvate transaminase (E.C.2.6.1.2) isoenzymes in British and New York populations.

1444 persons of British nationality living in London, and 294 Caucasians, 258 Negroes, 310 Hispanic persons, and 151 Chinese persons living in New York were tested for glutamate-pyruvate transaminase phenotype. The Gpt1 frequency in the British population was found to be 0.5277, the Gpt2 frequency was 0.4716, and two GPT 3-2 persons were found. The Gpt1 frequencies in the New York population were: 0.4834 in Chinese; 0.5226 in Hispanic persons; 0.8101 in Negroes; and 0.5306 in Caucasians. Two Caucasians possessed the GPT 3-2 phenotype.