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TJs expression is regulated by different viruses. The expression of TJs varies during infection by different viruses. Most viral infections downregulate the expression of TJs, but a few viruses promote their infection by upregulating the expression of TJs, such as HCV upregulates CLDN6, 9, 12, ZIKV-H upregulates ZO-1, PEDV upregulates OCLN, hPIV2 upregulates CLDN1. ↓: downregulated;↑: upregulated.
