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An eosinophil, a type of white blood cell. A new study shows these cells can be “summoned” to fight cancer. (Dr. Graham Beards/Wikimedia Commons)

An eosinophil, a type of white blood cell. A new study shows these cells can be “summoned” to fight cancer. (Dr. Graham Beards/Wikimedia Commons)

An eosinophil, a type of white blood cell. A new study shows these cells can be “summoned” to fight cancer. (Dr. Graham Beards/Wikimedia Commons)