unrubbed ( with endothelium preserved ) rings precontracted by prostaglandin f2 alpha in the presence of ketanserin relaxed in an endothelium-dependent manner to 5-ht , 5-carboxamidotryptamine and 5-methoxytryptamine with about equal potency and efficacy .
C0036751
5-ht
C0000589
5-methoxytryptamine