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Expanded ESI(+) mass spectra of the sample solutions (with AEMTS blocking) obtained from the short-term oxidative folding of HEL at 25 °C and pH 8.0 in the presence of 4 M urea. (a) Reduced HEL ([R]0 = 103 μM); (b) 1 eq DHSox; (c) 2 eq DHSox; (d) 3 eq DHSox; and (e) 4 eq DHSox were reacted with R for 1 min.
