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Major histocompatibility complex class I (MHC I) expression levels in neurons and glia. JCV Neu, JC virus un-infected neuron; JCV+ Neu, JCV-infected neuron; JCV+ Glia, JCV-infected glia. 0, no upregulation of MHC class I; 1; possible, weak upregulation of MHC class I, 2; robust upregulation of MHC class I.
