Fig. 5.

Lymphoproliferation of in vitro culture of spleen cells by MTT. Absorbency (OD490) represents the mean absorbance ± the standard error obtained from three independent assays. Oral2.5 and Oral5 represent chicks immunized orally with 2.5 and 5 g transgenic potato tubers, respectively. In2.5 and In5 indicate chicks vaccinated intramuscularly with the extracts of 2.5 and 5 g transgenic potato tubers, respectively. Vaccine indicates commercial modified live IBV vaccine. Control shows non-transgenic potato plant.