Fig. 2From: Synergy of melanin and vitamin-D may play a fundamental role in preventing SARS-CoV-2 infections and halt COVID-19 by inactivating furin proteaseConsequences of Vitmain D in human health and their metabolism in liver. The hydroxylated form, 25 OH vitamin D3 (25 D) in synthesized in liver and converted to most active form, 1,25,dihydroxyvitamin D (1, 25 D) by 1-α-hydroxylase (CYP27B1). CYP27B1, is the key factor to vitamin D biosynthesisBack to article page