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IFA comparison of PCV2 NC expression levels in PCV2-infected PKA cells and 293 cells transfected with pCEP5-6H-ORF2. (A) PKA cells infected with PCV2. (B) Mock-infected PKA cells. (C) 293 cells transfected with pCEP5-6H-ORF2. (D) Nontransfected 293 control cells. Cells were incubated with either polyclonal anti-PCV2 pig serum (positive serum) or PCV-negative pig serum (negative serum).
