Figure 4.

Photomicrography of immunohistochemical MMP-9 antigen detection in the frontal cortex of BoHV-5-infected calves (A-D). A) area of intense immunoreactions in the parenchyma; B-C) intense positive signals in the subependimal zones; D) no positive labeling was associated to control group. The strepavidin-biotin peroxidase complex method was used (scale bar 50 μm).