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Objective: The aims of this study were (1) to evaluate the usefulness of the new β2-adrenergic stimulant KUR-1246 as a tocolytic agent and (2) to clarify the mechanisms that underlie the diverse inhibitory effects of β2-stimulants that are seen in human myometria in vitro. Study Design: The displacement of tritiated ([3H]) (−)CGP 12177 (0.4 nmol/L) by KUR-1246 and other β2-stimulants was examined...