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Molecular biology has clarified the understanding of steroidogenic enzyme genetics. Nevertheless, there are discrepancies between fundamental and clinical experience. (1) Why do patients with "pure" 17 alpha-hydroxylase or 17,20-desmolase deficiency exist, when one cytochrome regulates both steps? A
In normal humans nearly half the renin in plasma and kidney is inactive. Human inactive renin can be activated by a variety of proteases and by exposure to low pH and is a putative biosynthetic precursor of renin, i.e., prorenin. Pulse-labeling studies in a human renin-secreting tumor suggest that