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Representative histology images of picosirius red stain for collagen in (a)–(c) RPA for CTL (a), HPH (b), HPH + CP (c); (d)–(f) lung for CTL (d), HPH (e), HPH + CP (f); and (g)–(i) RV for CTL (g), HPH (h), HPH + CP (i). Black arrows indicate pulmonary arteries in close proximity to large airways, and white arrow indicates a pulmonary vein surrounded by alveoli. Note, only the black arrow in panel (e) demonstrates significant collagen accumulation. Scale bar is 0.1 mm for all images.
