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Human Uniqueness Compared to "Great Apes":
Varicose veins are enlarged, visible and bulging superficial veins most commonly seen in the legs and thighs. In severe cases, varicose veins can rupture, or open sores (called "ulcers") can form on the skin. They are associated with damage to the valves in the veins of the legs, which normally prevent the backward flow of blood away from the heart. Varicose Veins are relatively common in humans but have not been reported in great apes.
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