ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Structure of the human immune system in a female body, computer artwork. Depicted are from top to bottom: Tonsils and adenoids (red circles), network of lymph nodes and lymphatic vessels (green), thymus (red), spleen (yellow), Peyer's patchtes (red dots within large intestine), appendix (red), and bone marrow (red, in femur).
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