Figure 1.

Validation of pHLIP to measure changes in extracellular pH in a cell culture model.
Figure 1A: Fluorescent labeling of HeLa cells with Alexa-647 labeled pHLIP at various extracellular pH conditions. Scale bars represent 10 μm.
Figure 1B: Quantification of fluorescence imaging measurements of HeLa cells at selected extracellular pH conditions (error bar represents standard error).