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Trypanosoma cruzi, the agent of Chagas' disease, is an obligate intracellular parasite that invades various organs including several cell types in the nervous system that express the Trk receptor tyrosine kinase. Activation of Trk is a major cell-survival and repair mechanism, and parasites could use Trks to invade cells as a strategy to protect their habitat and prolong parasitism of vertebrate hosts...