MIKKEL JUUL JENSEN / SCIENCE PHOTO LIBRARY MIKKEL JUUL JENSEN / SCIENCE PHOTO LIBRARY
Human immune system. Computer illustration showing the location in the human body of the major organs involved in the immune system. From top to bottom: tonsils (in neck, small red), thymus (upper chest, yellow), spleen (right of abdomen, yellow), lymph nodes (small, yellow, round), bone marrow (in long bones) and lymph vessels (long, thin, yellow).
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