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Turn residues affect folding and activity. A, CD spectra in the presence of negatively charged POPC/POPS liposomes. B, Cytotoxicity toward A549 cells. C, Uptake of fluorescein-tagged peptides in A549, with and without the presence of cell-uptake inhibitors. ****P < .0001; ***P < .001; **P < .01; ns = not significant. For interpeptide P values, see Table S1
