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Hydrogen-bonding networks and charge distribution inside the PCB-binding pocket. (A–C) Region surrounding the PCB chromophore for the two Pr isoforms (Pr-I, A and Pr-II, B) as well as for Pfr (C). Dashed lines highlight the hydrogen-bonding networks in the tetrapyrrole cavity. The + (blue) and − (red) signs represent the positive and negative charges, respectively. The conjugation pattern of the chromophore is colored in red for Pr (A and B) and purple for Pfr (C) (18).
