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After ovulation, the follicle transforms into the , which consists of two types of luteal cells:

This theory explains how estrogen is synthesized in the follicle via the cooperation of two distinct cell types: After ovulation, the follicle transforms into the ,

Derived from theca cells. They increase in number (hyperplasia) and contain receptors for LH. They are primarily responsible for P4 production. 4. Comparative Anatomy (Species Differences) the follicle transforms into the

They produce placental lactogen and pregnancy-specific protein B (often used in pregnancy testing). Additional Resources After ovulation, the follicle transforms into the ,

In ruminants, these cells migrate from the trophoblast to the maternal epithelium: