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Differential expression and cellular localization of activin and inhibin mRNA in the rainbow trout ovary and testis.

An inhibin cDNA from rainbow trout consisted of 1305 bp, which coded for 352 amino acid residues. The deduced amino acid sequence of mature inhibin was 50 to 60% identical to mammalian sequences. Distribution of inhibin alpha and activin beta A and beta B in different ovarian and testis compartments was studied in rainbow trout by in situ hybridization with complementary RNA probes. In testis tissue, inhibin alpha and activin beta A and beta B were expressed only in the testicular interstitia between the seminal lobules, where Sertoli cells and Leydig cells are distributed. The localizations and intensities of the reactions were constant throughout the maturation of the testis. Within ovarian tissue, the theca cell layers of follicles showed strong reactions of Dig-labeled antisense mRNA probes hybridizing against inhibin alpha and activin beta A and beta B in all samples over the same sampling period. In regressing oocytes, a positive reaction was observed in the granular cell layer of the follicles.