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(A) De novo protein design for vectorial hole transfer (red arrow) via Trp (green) and Tyr (blue) residues. Electronic excitation of a photooxidant (orange) triggers hole hopping. (B) Flickering resonance model for charge transport through the protein in A. The red arrow demarks the energy width (δE) that is comparable to the size of the coupling interactions (V) between hole-transfer partners that is required for a functional flickering resonance pathway.
