Tissue distribution of PGMRC1 (A) and mPRβ (B) mRNAs in rainbow trout. Tissues were collected from 3 different females during reproductive period. Ovaries were sampled at late vitellogenic stage. Testes were sampled at stage II of spermatogenesis . The mRNA abundance (mean ± SEM, N = 3 tissue samples originating from different individuals) of each gene was determined by real-time PCR and normalized to the abundance of 18S. For each gene, mRNA abundance was arbitrarily set to 1 for the "ovary" group.