Effect of HSP90AA1 and HSP90AB1 knockdown on TGEV infection. (A) TGEV M gene mRNA levels, (B) viral titers in the cell supernatants, and (C) N protein levels in WT and HSP90AA1 KD cells. (D) The band density of the protein was quantified using Image J software, and the TGEV-N to ACTB ratios were normalized to the control. (E) TGEV M gene mRNA levels, (F) viral titers in the cell supernatants, and (G) N protein levels in WT and HSP90AB1 KD cells. (H) The band density of the protein was quantified using Image J software, and the TGEV-N to ACTB ratios were normalized to the control. ** means p ≤ 0.01, ns means p > 0.05.