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. 2015 Nov 24;5:17125. doi: 10.1038/srep17125

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Displayed are the canonical Cys/His dyad and the exchangeable Ser. The Trp orientation would preclude direct involvement in the active site. Distances are in Angströms in green. Alpha helices are shown in red and beta strands in purple. Molecular graphics and analyses were performed with the UCSF Chimera package. Chimera is developed by the Resource for Biocomputing, Visualization, and Informatics at the University of California, San Francisco (supported by NIGMS P41-GM103311)⁴⁹.