1. The supernatant fraction obtained from fetal and adult gingivae differed in the total LDH activity. The activity of LDH in adult gingiva increased about 4 fold over that of the fetus.
2. Five isoenzymes of LDH were isolated from fetal gingiva.
3. The percentage composition of activity of LDH1, 2, 3, 4 and 5 in fetal gingiva differed from that of adult.
