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Nomenclature and sequences of the native E5 (E5-CSC) and the four cysteine mutants used in our study. The gray box represents the putative transmembrane segment between Leu7 and Leu29. At the N-terminus, there is an additional glycine due to hydroxylamine cleavage. The amino acid substitutions between positions 37 and 39 of the different E5-mutants are highlighted.
