Figure 1.

Effects of different doses of ouabain (top), digoxin (centre), and digitoxin (bottom) on the release of progesterone in the presence (solid columns) or absence (hatch columns) of hCG (0.5 iu ml⁻¹). ^*P<0.05, ^**P<0.01 compared with the value at drug=0 M, respectively. ++P<0.01 compared with vehicle-treated group. Each column represents mean±s.e.mean.