Thymus gland, light micrograph
Light micrograph of a section through an adult thymus gland. The thymus is an organ that hosts maturing immune system cells called T cells (T lymphocytes, purple). It is most active in children up to puberty. It deteriorates throughout adulthood and active tissue is replaced by fat tissue (white). Magnification: x200 when printed at 15cm wide., Photo by EYE OF SCIENCE/SCIENCE PHOTO LIBRARY
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