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Apical fluid-phase endocytosis by human airway epithelia stimulated by uPA and u7-peptide. Data are en face images showing Texas red–labeled dextran uptake. Shown are basal endocytosis (a), endocytosis after apical application of 50 nM uPA (b), 0.15 μM u7-peptide (c), or 0.15 μM scrambled u7-peptide (d), effect of uPA and peptides on number of cells showing endocytosis (e). n = 5, *P < 0.05.
