Expression of mRNAs for OCT4, DAZL and VASA in 1st and 2nd trimester ovary and testis. Open columns, 1st trimester, shaded columns 2nd trimester. Concentrations of mRNA are all relative to that of GAPD in the same samples. * P < 0.001 vs 1st trimester. Mean ± sem, n = 5–18 per group.