Assertion: kidney | /r/CapableOf | synthesize vitamin d3
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text: 2 million HFs of the human mammalian integument13 may possess, this is surely dwarfed by that of our kidneys, which—besides many other functions—crucially regulate the volume, osmolality, electrolyte balance and pH of both plasma and urine, and synthesize hormones like vitamin D3 and erythropoietin [EPO]11, 12.