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Amino-acid sequences of the PsaA and PsaB subunits of PSI from T. elongatus, Synechocystis PCC 6803 (S.6803), Chlamydomonas reinhardtii (C. reinhardtii), and spinach. PsaA/PsaB residue pairs in each line were generated from the protein sequence alignment performed with the CLUSTAL program (31).
