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Figure 3: The effects of the Yangjing capsule extract on testosterone production were inhibited by PKA inhibitor H89. The Yangjing capsule extract was used to treat cells combined with or without 5 μM and 10 μM H89 for an incubation period of 24 h. The results are given as the means ± SD from three independent experiments. Compared with treatment with the Yangjing capsule extract alone, .