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Histochemical staining of elastin and collagen fibers in wild-type (WT) and Crtap knockout (KO) lung sections. Representative images of WT (top) and CrtapKO (bottom) lung sections at 3 mo of age, stained with the Verhoeff-Van Gieson protocol. Elastic fibers are stained blue-black (black arrows) while collagen fibers are stained in red (light blue arrows). Images at ×40 are magnifications corresponding to the red boxed areas.
