RT-qPCR expression analysis of texim genes in adult tissues of Xiphophorus maculatus population Rio Jamapa. All qPCR results were normalized against the ribosomal protein L7 housekeeping gene rpl7, the value 1 was assigned to the tissue/organ with the highest level of expression. M: males (in blue); F: females (in red). TeximYa, teximYb, texim1 and texim4 are preferentially expressed in testis, with teximYb being almost exclusively expressed in the male gonad. Texim1 is also significantly expressed in ovaries. Texim2 and texim3 show predominant expression in brain.