DON W. FAWCETT / SCIENCE PHOTO LIBRARY DON W. FAWCETT / SCIENCE PHOTO LIBRARY
Colour enhanced photomicrographs of human endometrium (lining of the uterus) in different days of the cycle of pregnancy. From the left: proliferative endometrium (9th day), gestational hyperplasia (12th day), early secretory endometrium (15th day), and secretory endometrium (19th day).
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