Haemosiderin macrophages, light micrograph
Light micrograph of haemosiderin pigment (dark brown clumps) that has been ingested by macrophages (pink circles), a type of immune cell. The haemosiderin originates from the metabolism of haemoglobin from extravasated red blood cells (bright red). Haematoxylin and eosin stained tissue section. Magnification: x600 when printed at 10cm wide., by ZIAD M. EL-ZAATARI/SCIENCE PHOTO LIBRARY
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