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Uterus during menstrual cycle. Light micrograph of a normal cervical smear showing cells of the uterine endometrium during the secretory (luteal) phase of the menstrual cycle. The endometrium is the inner lining of the uterus that undergoes changes during the menstrual cycle. Here after ovulation (egg release), the cells (red & blue) clump together to form a thick endometrium. Their grainy cytoplasm is due to the presence of glycogen. During the secretory phase, triggered by the hormone progesterone, these cells secrete glycogen, lipids and sugars as nutrients for a possible fertilised egg. Papanicolaou stained cells. Magnification: x200 at 35mm size.
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