a picture of a blood cells with a red vein
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blood clot or thrombus blocking the red blood...
A red blood cell is shown in a spiral
blood cells
a picture of a red vein that is labeled blood
Red blood cells flowing through vein Human bo...
Blood vessel cell Artery and healthy Circulat...
Red blood cells in vein Blood cells flowing t...
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Red blood cells inside an artery vein flow of...
血管
Blood circulation vessels illustration medica...
被胆固醇阻塞的动脉。矢量图
