Abstract
Herein, we developed a ratiometric two-photon probe (BHS3-EGF), derived from a pH sensitive dye and epidermal growth factor (EGF), for real-time monitoring and quantitative analysis of acidic luminal pH values during endocytic pathway activity. Two-photon microscopy imaging with BHS3-EGF allows the quantitative analysis of pH distributions of single vesicles and their dynamics in receptor-mediated endocytosis in real-time.
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