Problems in the estimation of niacin and riboflavin by microbiological methods.
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D006801:Humans; D009525:Niacin / Q000032:analysis*; D009539:Nicotinic Acids; D012256:Riboflavin / Q000032:analysis*
D009539:Nicotinic Acids; D009525:Niacin; D012256:Riboflavin