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Effect of SP (100 nmol/L), NKA (100 nmol/L), NKB (100 nmol/L), [Sar9] SP (100 nmol/L), (β-Ala-8)-NKA (100 nmol/L), and Senktide (100 nmol/L) on spontaneous contractions in longitudinal smooth muscle of rabbit duodenum. Arrowheads indicate the addition of agents.
