1VYK:
reference: The 1.49 A resolution crystal structure of PsbQ from photosystem II of Spinacia oleracea reveals a PPII structure in the N-terminal region., Balsera M, Arellano JB, Revuelta JL, de las Rivas J, Hermoso JA, J Mol Biol. 2005 Jul 29;350(5):1051-60. PMID: 15982665

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