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Different accessibility of CTRS sequence in wt MA (A) and R55F MA (B). CTRS sequence (residues 43–60) is shown as a red ribbon and the rest of the proteins as a gray van der Waals surface; residues 55 (Arg in wt MA and Phe in R55F MA) are represented as green side-chain structures. C-terminal domains (helices III and IV) are oriented identically in both molecules.
