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Effects of ouabain (hatch columns), digoxin (crosshatch columns), and digitoxin (solid columns) on the release of progesterone in rat granulosa cells in response to different doses of 8-Br-cAMP. **P<0.01 compared with vehicle group, respectively. +P<0.05, ++P<0.01 compared with 8-Br-cAMP=0 M, respectively. Each column represents mean±s.e.mean.
