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. Author manuscript; available in PMC: 2011 May 2.
Published in final edited form as: Curr Opin Colloid Interface Sci. 2010 Apr 1;15(1-2):13–17. doi: 10.1016/j.cocis.2009.06.002

Fig. 3.

Fig. 3

Proteins designed to accommodate nonbiological cofactors (diphenyl iron porphyrins). (a) Single-chain protein binding two equivalents of the cofactor [22•]. (b) Homotetrameric alpha-helical bundle that presents a linear array of the nonbiological cofactors [21•].