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. 2015 Nov 26;5:17260. doi: 10.1038/srep17260

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The outer membrane permeability of E. coli UB1005 in the presence of different peptide concentrations (dCATH, ME-26) was determined using the fluorescent dye (NPN) assay. The NPN uptake was monitored at an excitation wavelength of 350 nm and an emission wavelength of 420 nm (*P < 0.05; **P < 0.01; by unpaired t test).