Assertion: neanderthal's gene | /r/HasProperty | expressed in testis
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text: These large regions of low Neanderthal contribution were most-pronounced on the X chromosome—with fivefold lower Neanderthal ancestry compared to autosomes—and contained relatively high numbers of genes specific to testes, meaning that modern humans have relatively few Neanderthal genes that are located on the X chromosome or expressed in the testes, consistent with the fact that male infertility is affected by a disproportionately large amount of genes on X chromosomes....