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VIP (0.3 μM) induced powerful relaxation of bovine intraocular long posterior ciliary artery rings, which decayed to a lower but stable level within ∼25 min. In this state, a second addition of VIP failed to promote further relaxation. Data are mean±s.e.m.; n=12; ***P<0.001 indicates difference from the maximal relaxation induced by VIP.
