Requirement for Erk1/2 Activation in the Regulation of Progesterone Production in Human Granulosa-lutein Cells Is Stimulus Specific Erk1/2 Activation Was Reduced by Preincubation with Pka Inhibitors, including Myristoylated Pki, Suggesting That Camp Mediates Erk1/2 Activation. Two Structurally Disti