StAR mRNA transcription. StAR mRNA transcription in pseudopregnant and pregnant CLs (upper panel) and placenta (lower panel). Letter “a” indicates no statistical differences within pseudopregnancy. Letters “x, y” indicate statistical differences within pregnancy (P < 0.001). Asterisks indicate statistical differences between StAR mRNA levels during the course of pseudopregnancy and pregnancy (***P < 0.001).