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Pronunciation: per'for-in

Definition: A protein found in the cytoplasmic granules of both T-cytotoxic lymphocytes and natural killer cells. This protein is implicated in target cell lysis by the above cells.

[L. per-foro, to bore, pierce, + -in]

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.