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The basal motility index (MI) of colon muscle strips treated with progesterone (P4) (2 mg/kg per day) or saline intramuscular (IM) for 4 days. A: basal motility tracings of muscle strips from guinea pigs treated with saline (control) or P4. B: P4 decreased the basal MI of muscle strips compared with saline treatment (*P < 0.01 by ANOVA). Values are means ± SE of basal MI (n = 4).
