cell line nci-h727 was exposed in vitro to the endogenous amine serotonin and its precursor 5-hydroxytryptophan ( 5-htp ) , to the tobacco-related amine nicotine , and the tobacco-related nitrosamines n-nitrosodiethylamine ( den ) and 4- ( methylnitrosamino ) -1- ( 3-pyridyl ) -1-butanone ( nnk ) .
C0028197
nitrosamines
C0012200
nitrosodiethylamine