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A new ratiometric fluorescent probe based on cell-penetrating peptides (CPPs) was constructed for whole-cell pH mapping and simultaneous measurement of pH changes in the cytoplasm and lysosomes. The arginine-rich CPP, R12K worked as linker, carrier and part of the fluorophore. Benefiting from R12K, the fluorescent probe is completely water soluble, membrane permeable and well biocompatible. It shows...
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