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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 desensitised to substance P (0.1 μM) or in the presence of NK1 antagonist, L-733,060 (0.3 μM). Desensitisation to substance P or incubation with L-733,060 had no effect on either the first (a) or second (b) components of relaxation. Data are mean±s.e.m.; n⩾5.
