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Arrangement of residues in PsaA/PsaB of PSI. (Blue and red sticks) Side chains of basic and acidic residues, respectively. (a) Residues increasing Em(PA) or Em(PB). (b) Residues decreasing Em(PA) or Em(PB). (c) Residue pairs enhancing Em(PA) > Em(PB). (d) All acidic and basic residues in PsaA/PsaB.
