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Frequency–response curves to EFS (0.5–128 Hz) in control bovine intraocular long posterior ciliary artery rings and in those pretreated with capsaicin (1 μM) or CGRP8–37 (5 μM). Neither the first (a) nor the second (b) component of relaxation was affected by capsaicin or CGRP8–37. Data are mean±s.e.m.; n⩾4.
