Lesch–Nyhan syndrome
Lesch–Nyhan syndrome (LNS), also known as Nyhan's syndrome, Kelley-Seegmiller syndrome and Juvenile gout, is a rare inherited disorder caused by a deficiency of the enzyme hypoxanthine-guanine phosphoribosyltransferase (HGPRT), produced by mutations in the HPRT gene.
Peter the Great: the Russian czar levied a tax on beards (1698)
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