Additional Supporting Information may be found in the online version of this article.

PROT_22858_sm_suppfig.pdf391KSupporting Figure 1: Calcium ions interacting with BthTX-II in the crystallographic structure of the complex. Four calcium ions which interact with equivalent regions of the dimer are observed in the model. Only distances below 3.6Å were considered for calcium interactions, a value that includes primary and secondary coordination spheres.

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