AMI IMAGES / SCIENCE PHOTO LIBRARY AMI IMAGES / SCIENCE PHOTO LIBRARY
Blood cells. Coloured scanning electron micrograph (SEM) of a lymphocyte white blood cell (white) and two red blood cells (erythrocytes, red). Lymphocytes are involved in the immune system's defence mechanisms, lymph system, and involved in antibody production. Red blood cells are biconcave, disc-shaped cells that transport oxygen from the lungs to body cells.
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