Analysis of the NMR solution structure of CcTx (Figure 2) showed that the backbone of the C-terminal region was well defined with three disulfide bridges, a series of turns, including a Type I’ β-turn for Cys-12-Tyr-15 and a partially distorted Type I β-turn for Asn-16-Thr-19, preceding the short α-helix Ser-23-Thr-27.
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