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KGF stimulates proliferation of differentiated human airway epithelia, as assessed by BrdU labeling. KGF treatment at 50 ng/ml caused substantial labeling of nuclei (B) and increased the height of the epithelial layer (D) compared with control epithelia (A and C). (E) Percentage of BrdU-positive nuclei for control and KGF-treated cells from three separate airway cell preparations.
