we determined the serotonin ( 5-hydroxytryptamine , 5ht ) content of growth factor dependent mouse mast cell lines or clones , and measured their ability to synthesize and store 3h-5ht from exogenous 5-hydroxy- [ g-3h ] -tryptophan ( 3h-5htp ) in vitro .
C0041249
tryptophan
C0000578
5htp