Figure 3From: Modulation of the host Th1 immune response in pigeon protozoal encephalitis caused by Sarcocystis calchasiImmunohistochemical labelling of a tissue cyst with polyclonal antiserum to S. calchasi in the brain of pigeon no. L60 during the second phase of disease. No associated pathological lesions can be seen. In total, four tissue cysts were identified in the neuropil of this pigeon. Bar, 50 μm.Back to article page