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Effect of sub-fraction F2c of Pycnocycla spinosaextracts on tonic contractions developed in rat isolated ileum by KCl (80mM). Time-matched control tissues treated with vehicle in equivalent volume. Results are given as mean and vertical bars indicate S.E.M. (n=6). Stars show statistically significant differences between the test and control groups at corresponding points. *P<0.05 **P<0.01, ***P<0.001 (Student's t-test).
