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*{{pmid187054}}
*<b>[http://www.kidney.de/mlpefetch.php?search=187054 Vitamin D, its metabolites and analogs: a review of the structural requirements for biological activity ]</b> Am J Clin Nutr 1976; 29(11) ; 1271-82 Procsal DA; Okamura WH; Norman AW
*187054*