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. Author manuscript; available in PMC: 2014 Mar 12.
Published in final edited form as: Biochim Biophys Acta. 2004 Apr 12;1655(0):140–148. doi: 10.1016/j.bbabio.2003.07.004

Fig. 3.

Fig. 3

Some possible Mn4 clusters and oxygens extracted from the hollandite lattice in categories that are compatible with that associated with the OEC. Structures are organized according to m, the number of 2.7– 2.8-Å Mn–Mn vectors and n, the number of 3.3–3.4-Å vectors, and given the designation (m, n). Mn atoms are in red and only the bridging O atoms (in blue) are shown. Some of the motifs identified in these tunnel-like minerals were previously proposed to be compatible with the EXAFS data from the OEC; they are identified by the alphabet according to DeRose et al. [1] and Robblee et al. [31]; others are an entirely new class of topological alternatives that need to be explored as candidates for the OEC. Adapted from Sauer and Yachandra [34].