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Representative MS spectra of key peptic peptides after H/D exchange experiments of caspase-6 maturation variants. The relative location and charge-state distribution of peptides from additional highlighted regions: yellow, L3; light pink, L4; blue, N-terminal part of linker; magenta, C-terminal part of linker. The asterisk designates the D to A substitution at the indicated proteolytic cleavage site, rendering that site uncleavable.
