Panel A contains representative Western blots for SCARB1, LDLR, ABCA1, ABCG1, and TUBB using samples pooled from CL collected at either the mid-late (ML), functional late (FL), functionally-regressed late (FRL), or very-late (VL) stages of the luteal phase. The results of densitometry analyses of individual luteal homogenates (n = 4 CL/group) for the lipoprotein receptors SCARB1 and LDLR, as well as the cholesterol efflux proteins ABCA1 and ABCG1, are presented in panels B and C, respectively. Error bars indicate one standard error of the mean (SEM). Columns with different letters of the same case are significantly different (p< 0.05).