Jacob is constantly telling his friends how sad it is that he sees so much skin cancer at his office—especially since so much of it could be prevented through the use of sunscreen. He is a dermatologist, and today he had two patients come in with what appeared to be cancerous moles. He removed the moles on both patients and prepared samples for histological examination. Jacob wanted to know whether either of the cancers had metastasized and gained the ability to move throughout the body. Tissue from Patient 1 included fibroid, spindle-shaped cells that resembled mesench
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