Doellgast G J, Kennedy M, Donald L J
Hum Hered. 1980;30(1):18-20. doi: 10.1159/000153082.
Samples of the rare SD, FD and ID phenotypes of placental alkaline phosphatase were compared by starch gel electrophoresis and by measuring L-leucine inhibition with the numbered phenotypes of Donald and Robson. The 'D-variant' was found to be identical to 'variant 18'. 'Variant 17' was also found to be inhibited by L-leucine to the same extent as 'variant 18'. There was a statistically significant excess of male births with the variant 18 enzyme.
