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(a) Schematic depicting how affibody photocrosslinked to EGFR causes recycling of the the affibody to the cell surface [63]. (b) Confocal images showing pH-stable Alexafluor 488 and pH-sensitive pHAb. The photocrosslinked affibody-enzyme is internalized in endosomes at 4 h and 12 h but returns to the surface after 24 h [63].
