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Phylogenomic and phylogenetic analyses support a conserved role for the membrane-bound rubredoxin in PSII accumulation. A, phylogenetic reconstruction of the relationship of rubredoxins from indicated species. B, highly-conserved six gene arrangement encoding rubA (RBD1), a PSII assembly factor (ycf48), and four PSII subunits is found in nearly all sequenced cyanobacteria, with exceptions noted under “Results.”
