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wood prints blood cell wood prints blood cells wood prints platelet wood prints platelets wood prints red blood cell wood prints red blood cells wood prints white blood cell wood prints white blood cells wood prints sem wood prints scanning electron micrograph wood prints micrograph wood prints micrographs wood prints micrography wood prints erythrocyte wood prints erythrocytes wood prints

photographs blood cell photos blood cells photos platelet photos platelets photos red blood cell photos red blood cells photos white blood cell photos white blood cells photos sem photos scanning electron micrograph photos micrograph photos micrographs photos micrography photos erythrocyte photos erythrocytes photos

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Blood cells and platelets. Colored scanning electron micrograph (SEM) of human blood showing red and white cells and platelets. Red blood cells (erythrocytes) have a characteristic biconcave-disc shape and are numerous. These large cells contain hemoglobin, a red pigment by which oxygen is transported around the body. They are more numerous than white blood cells one of which is visible in this sample. White blood cells (leukocytes) are rounded cells with microvilli projections from the cell surface. Leucocytes play an important role in the immune response of the body. Platelets are smaller cells that play a major role in blood clotting.