Effect of MMP inhibitors on oxytocin-induced contraction. Uterine strips of virgin (A), mid-Preg (B), and late-Preg rats (C) were pretreated with SB-3CT, BB-94, or Ro-28–2653 (10−6 M) for 30 min. The uterine strips were stimulated with oxytocin (10−11 to 10−7 M), and the contractile response was recorded and presented (in g/mg tissue wt). Data represent means ± SE, n = 4 to 6. *Significantly different (P < 0.05).