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Levels of cytokine production from peripheral blood mononuclear cells after the capsid protein stimulation in vitro (n=5; i.e., number of pigs analyzed in each experimental group). Five peripheral blood samples from five piglets in each group were collected via the vena cava at 21 days after the boost immunization. Values are expressed as mean counts±standard error. *p<0.05 (compared with pBudCE4.1 or PBS); **p<0.05 (compared with pBudCE4.1-ORF2).
