The conversion of L-and D-tryptophan to niacin in human body.
D000818:Animals; D018594:Human Body; D006801:Humans; D009525:Niacin / Q000378:metabolism*; D051381:Rats; D014364:Tryptophan / Q000378:metabolism*
D009525:Niacin; D014364:Tryptophan
NICOTINIC ACID/metabolism; TRYPTOPHAN/metabolism