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Calculated structures of wt and R55F MA. Representative structures of wt MA (A) and R55F MA (B) are colored in red (helix I), yellow (helix II), light blue (helix III), and dark blue (helix IV), and the flexible loop between helices II and III is in green (residues 42–51). Structures are displayed with identical orientation of the C-terminal domain (helices III and IV). Images were created in Pymol (http://www.pymol.org).
