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HPLC analysis of pigments extracted from Rba. sphaeroides strains. Pigments were extracted from strains standardized by cell number. (A) ∆bchE∆ccoP. (B) ∆bchE∆ccoP∆6110. (C) ∆bchE∆ccoP∆6110 + pBB[6110]. (Insets) Retention times and Soret/Qy maxima of peaks were used to identify Mg- and Zn-chelated species of BChl a.
