Educational illustration style: Progressive size comparison showing uterus growing from non-pregnant size (small, pear-shaped, approximately 7cm) to full-term pregnant size (large, approximately 35cm). Pink estrogen molecules (E symbol) surrounding and interacting with uterine tissue. Blood vessel network (red branching vessels) visibly expanding and proliferating throughout uterine wall. Before/during/after comparison with size measurements. Animated growth effect. Labels: "Estrogen", "Uterus growth", "Blood vessel development", "Non-pregnant → Pregnant". Medical diagram style.
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