English: Drawing of a vein, cross section. The blue arrow shows the direction of blood flow, the small yellow things are endothelial cells with the nucleus shown, the big wellow things are the valves.
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{{Information |Description={{en|1=Drawing of a vein, cross section. The blue arrow shows the direction of blood flow, the small yellow things are endothelial cells with the nucleus shown, the big wellow things are the valves.}} {{az|1=Vena damarının qur
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