chronic villi are formed modification of
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The chorion is formed by mesoderm tissue from the mother and trophoblast cells derived from the forming fetus. The chorionic villi emerge from this chorion and enter the endometrium. Chorionic villi are microscopic, finger-like projections that contain capillaries for blood to flow through.
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chorionic villi are formed by trophoblast cells and mesodermal tissue..
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