Figure 7From: The effect of O-antigen length determinant wzz on the immunogenicity of Salmonella Typhimurium for Escherichia coli O2 O-polysaccharides deliveryRepresentative images of immunohistochemical staining of E. coli O2 after challenge in birds. Immunohistochemical staining were performed on paraffin-embedded section of chicken liver and spleen tissues. The hematoxylin-stained nucleus are blue, DAB positive expression is brownish yellow. Scales bars = 100 μm.Back to article page