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Overlay HSQC spectra of ChCh107 (black) with (a) GB1-ChCh107 (red) and (b) ChCh107-GB1 (red). The addition of an N-terminal fusion to ChCh results in a severe disruption of the secondary structure resulting in an aggregation/unfolding of the protein (a), while a fusion to the unstructured C-terminal tail results in a well-folded protein (b). The well dispersed cross peaks (indicated by an overlaid gray dot) in the spectrum of ChCh107-GB1 arise from the GB1 tag.
