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Cyanobacteria have multiple psbA genes encoding PsbA, the D1 reaction center protein of the Photosystem II (PSII) complex. The thermophilic cyanobacterium Thermosynechococcus elongatus has three psbA genes differently expressed depending on the environmental conditions. Among the 344 residues of PsbA, there are 21 substitutions between PsbA1 and PsbA3, 31 between PsbA1 and PsbA2 and 27 between PsbA2...
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