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. 2021 May 10;11:654300. doi: 10.3389/fonc.2021.654300

Figure 5.

Figure 5

Emission spectroscopy of sodium fluorescein (NaFl) under in vitro and ex vivo conditions. Exposure of NaFl to the tumor microenvironment shows a broadening and a bathochromic shift of the dye’s emission spectrum. The pH sensitivity and the concentration-dependent reabsorption effect of the dye contribute to this red shift.