CLAUDIA STOCKER / SCIENCE PHOTO LIBRARY CLAUDIA STOCKER / SCIENCE PHOTO LIBRARY
Neutrophil white blood cell, illustration. Neutrophils are the most abundant white blood cell in humans. They have a multi-lobed nucleus (dark purple). White blood cells are part of the body's immune system. Neutrophils engulf and digest invading bacteria, and are the predominant cells in pus.
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