Welch S G, Lee J, McGregor I A, Williams K
Hum Hered. 1975;25(5):414-7. doi: 10.1159/000152754.
The red cell GPT phenotypes have been determined in two village populations in Gambia, West Africa. A total of 887 people have been investigated. The results confirm the previous observations that the frequency of the GPT gene is far higher in African populations than Caucasian populations.