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NMR structures of the ShK toxin and κ-conotoxin PVIIA oriented with the pore inserting lysine pointing downward. In ShK, there are three disulfide bonds (C3–C35, C12–C28, and C17–C32), and three other bonds (D5–K30, K18–R24 and T6–F27), which make the structure very stable. In PVIIA, there are three disulfide bonds (C1–C16, C8–C20, and C15–C26), and two other bonds (R2–K7 and Q10–N24).
