The human steroid 21-hydroxylase gene (CYP21A2) participates in cortisol and aldosterone biosynthesis. and resides together with its paralogous (duplicated) pseudogene in a multiallelic copy number variation (CNV). called RCCX CNV. Concerted evolution caused by non-allelic gene conversion has been described in great ape CYP21 genes. https://fitnessgravesyardes.shop/product-category/rear-pedal-cover/