The metabolic conversion of tryptophan to nicotinic acid and to N'-methylnicotinamide.
D009525:Niacin / Q000378:metabolism*; D009536:Niacinamide / Q000031:analogs & derivatives; D009539:Nicotinic Acids; D014364:Tryptophan
D009539:Nicotinic Acids; D009536:Niacinamide; D009525:Niacin; D014364:Tryptophan; C008472:N-methylnicotinamide
NICOTINIC ACID/metabolism; TRYPTOPHANE