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Structure of phycoerythrin from Gloeobacter violaceus at 2.19 Å resolution, PDB entry 2VJH [4]. (A) View of the dodecamer along the phycobilisome stacking axis. (B) Side view of a tetrameric unit, perpendicular to the stacking axis. The protein backbone is shown in grey. Phycoerythrobilins are shown in pink, phycourobilins in violet.
