Two recent studies implicate the complement system in prion disease pathogenesis, suggesting that there are multiple, non-exclusive pathways of neuroinvasion (pages 485–487 & 488–492).
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Cardone, F., Pocchiari, M. A role for complement in transmissible spongiform encephalopathies. Nat Med 7, 410–411 (2001). https://doi.org/10.1038/86469
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DOI: https://doi.org/10.1038/86469
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