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Mean percentage cytotoxicity of iIELs against Vero cells. The iIELs obtained from different groups of chickens immunized orally with intermediate plus strain of IBDV with or without l-arginine were used for the MTT cytotoxicity assay. Elevated iIELs cytotoxicity was found in IP + l-arginine group compared with IP. Means with no common superscript differ significantly (P < 0.05).
