Uterus (early proliferation). Coloured scanning electron micrograph (SEM) of the surface lining or endometrium of the human uterus during the early proliferative stage of the menstrual cycle. This lining builds up (early/late proliferation) in the first 14 days of the cycle to prepare for pregnancy, an egg is released, and then the lining becomes secretory to nourish the embryo. If no pregnancy occurs, it breaks down at menstruation after 28 days. Here, in early proliferation there is bridging & cell regeneration. Secretory (blue) and ciliated (green) cells are of small size. A uterine gland is developing (far left, dark entrance). Magnification: x580 at 5x7cm size.
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