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Spindle-shaped, alpha-smooth muscle actin positive fibroblastic cells were found to co-localise with collagen III propeptides in serial sections of peripheral bronchioli. Almost no expression of procollagen I was seen (A-D), with variable expression of collagen III propeptide (E-H) and co-localization of spindle-shaped alpha-smooth muscle actin positive fibroblastic cells (I-L, arrows), with immunohistochemistry for vimentin (M-P, M with negative PBS-control).
