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Patterns of lactate dehydrogenase isoenzymes during gonadogensis in the rat

Summary. The isoenzymes of LDH were detected by polyacrylamide gel electrophoresis. The M and H LDH subunits were present in gonads of both sexes from Day 14p.c. and there was some variation with increased gestation. From Day 20 after birth two specific LDH-X bands (X₁ and X₂) were evident in the spermatocyte-rich fraction, but not in those of the Sertoli and Leydig cell fractions or those of the ovary.