Ovarian section and corpus luteum, light micrograph
Light micrograph showing a human ovarian section and corpus luteum. The corpus luteum is made from a follicle that housed a maturing egg. The structure starts to form as soon as a maturing egg pops out of the follicle. This hormone-secreting body in the female reproductive system is essential for conception to occur and pregnancy to last., Photo by NIGEL DOWNER/SCIENCE PHOTO LIBRARY
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