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. 2014 May 7;8(6):6171–6181. doi: 10.1021/nn5015962

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Confocal fluorescence microscopy images of MCF-7 cells treated with (a) 100 mM l-histidine, 150 mM K⁺, and 60 nM active G_{4-l-histidine}; (b) 100 mM l-histidine, 150 mM K⁺, and 60 nM in active G_{4-l-histidine-R}; (c) 60 nM active G_{4-l-histidine}; (d) 100 mM l-histidine and 60 nM active G_{4-l-histidine}; (e) 150 mM K⁺ and 60 nM active G_{4-l-histidine}. The green channel is FAM fluorescence. Differential interference contrast (DIC) microscopy images of cells are shown in the second column. Overlap of fluorescence and DIC images are shown in the third column. Scale bar = 20 μm.