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Comparison of the active sites of A. acidocaldarius SHC and Z. mobilis SHC1548. ShcAac and ZMO1548-Shc amino acids are given (ShcAac at the top and ZMO1548-Shc at the bottom). The squalene analogue 2-azasqualene is shown in gray. Note the almost identical positions of residues in the two SHCs.
