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. Author manuscript; available in PMC: 2009 Jun 1.
Published in final edited form as: J Struct Biol. 2008 Mar 25;162(3):480–490. doi: 10.1016/j.jsb.2008.03.006

Figure 1.

Figure 1

Schematic outlining the use of post-imaging fiducial markers for determining the lower-order symmetry of a complex, and for generating an initial reference to be used in further refinement.