Pathology

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Pathology
A sign indicates the presence of a pathology lab in a hospital. (TV: The Hand of Fear)

Pathology was a medical branch of science. Doctor Carter, a pathologist, assisted the Fourth Doctor in examining Eldrad's hand by means of an electron microscope. (TV: The Hand of Fear)

George Litefoot was a pathologist in the 19th century. (TV: The Talons of Weng-Chiang)