human_reference_atlas cell cell type (from CL) epithelial cell ionocyte Specialized epithelial cells involved in the maintenance of osmotic homeostasis. They are characterized by abundant mitochondria and ion transporters. In amniotes, they are present in the renal system. In freshwater fish, ionocytes in the skin and gills help maintain osmotic homeostasis by absorbing salt from the external environment. ionocyte epithelia CT ionocyte epithelia CL:0005006 Homo sapiens prostate epithelium prostate gland