FIG. 3.

Pentachrome staining in plexiform lesions in the pulmonary vasculature of rhesus macaque CNPRC 4 infected with SHIVnef. Paraffin-embedded sections of the lungs of macaque CNPRC 4 were stained with Movat's pentachrome (A–D). Note that this monkey exhibited major remodeling with obstructive lesions at 37 WPI. Arrows indicate obliterated lumena. Note that the obliterative lesions are composed mostly of fibrin (bright red) and muscle (red) surrounded by mucin (light blue in A, B). Elastic fibers are shown in black (C, D). Collagen/reticular fibers are shown in yellowish color in (C). All images were captured at 200 × magnification.