Fig. 6From: Monitoring the immune response of macrophages in tuberculous granuloma through the expression of CD68, iNOS and HLA-DR in naturally infected beef cattleiNOS+ Cells. The iNOS+ immunolabeling fraction was higher in the early-stage granulomas compared with the late stages, with a significant difference between stage I and stage IV (** =P < 0.002)Back to article page