Coloured transmission electron micrograph (TEM) showing eosinophil granules. They are trilaminar membrane-bound (red) organelles that contain a crystalloid core (purple) surrounded by a matrix (blue). The crystalloid core contains major basic protein (MBP); the matrix has eosinophil cationic protein (ECP), eosinophil-derived neurotoxin (EDN), and eosinophil peroxidase (EPO).

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Photo credit: © JOSE CALVO / SCIENCE PHOTO LIBRARY / Alamy / Afripics
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