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This article has been reviewed according to Science X's editorial process and policies . Editors have highlighted the following attributes while ensuring the content's credibility: Add as preferred source Credit: Unsplash/CC0 Public Domain Scientists have long believed that tissue-resident memory T cells—which remain in tissues after an infection has cleared and respond rapidly if the threat returns—are shaped primarily by biochemical signals. A McGill University–led study has now uncovered a previously unknown ability of T cells that could change our understanding of how long-term immunity develops.

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