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Effect of increasing concentration of VIP28, unlabeled TP3654, and unlabeled TP3982, on resting opossum IAS smooth muscle tissue. At 1 × 10−6 mol/L TP3654 and TP3982, ~95% relaxivity was achieved with ~75% for VIP28 at the same concentration. Data suggest that biologic activity of TP3982 was not compromised.
