FIG. 1.

Typical immunohistochemical staining patterns using Fast Red chromogen and hematoxylin counterstain (clockwise from top left). A. Section of heart demonstrating positive interstitial and mononuclear cells and myofibers. Bar, 35 μm. B. Section of cerebrum with positive neurons surrounded by positive glial cells. Bar, 35 μm. C. Section of kidney showing positive mononuclear cells in the interstitium, peritubular capillaries, and a large blood vessel in a collecting duct area. Bar, 35 μm. D. Section of liver with positive Kupffer cells. Bar, 75 μm.