Fig. 7. Changes in nuclear factor kappa B (NF-κB) DNA-binding activity after porcine circovirus type 2 (PCV2) infection. An electrophoretic mobility shift assay was used to measure NF-κB DNA-binding activity after 6, 12, 24, and 48 h in the control, PCV2, MyD88 small interfering (si)RNA, and PVC2 + MyD88 siRNA groups; ^*p < 0.05, ^**p < 0.01.