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Functional effect of mutations in the Sc and Se sites of SSS proteins
a SC followed by a number indicates the substitution of the native residue at the indicated position with a cysteine in a cysteine-free protein.
b X represents several replacements.
c Boldface type indicates the position studied in this work. Pro, proline; Gal, galactose; NEM, N-ethylmaleimide; F5M, fluorescein 5-maleimide.
