
Transcription profile of the testis. (A) Gene expression levels (inTPM) of spermatogenesis cell-type marker genes categorized into four different stages—undifferentiated spermatogonia, spermatocytes, round spermatids, and testis niche cells—in testis of collared flycatcher, pied flycatcher, and their F1 hybrids. (B) Number of genes expressed at an expression level TPM > 1 for the five tissues, for collared flycatcher, pied flycatcher, and their F1 hybrids.











