Fig. 6From: Trigger factor assisted soluble expression of recombinant spike protein of porcine epidemic diarrhea virus in Escherichia coli Reactivity of purified rGST-COE and rGST-S1D with pig anti-PEDV immune sera in an indirect ELISA. The rGST was included as a negative control. Error bars indicate the standard deviations of the means. The asterisk indicates the p values that are less than 0.05Back to article page