results were as follows : 1 ) the rank order of potency for inducing a vasoconstriction in external ophthalmic arteries ( eoa ) was 5-ht greater than or equal to epi greater than ne greater than phe much greater than atp greater than or equal to da greater than kcl much much greater than tyr , xyl , clo .
C0014563
epi
C0028351
ne