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. Author manuscript; available in PMC: 2012 Jul 1.
Published in final edited form as: J Photochem Photobiol B. 2011 Mar 17;104(1-2):60–71. doi: 10.1016/j.jphotobiol.2011.01.026

Figure 1.

Figure 1

The environments of YZ (A) and YD (B) from the 2.9 Å X-ray structure of PSII [27]. In (A), the manganese ions are gray, and the calcium ion is orange.