Figure 6.

Difference mobility profiles calculated for ds26. (A), With Li⁺ as the binding ion and: (o), TMA⁺; (△), TEA⁺; (◇), TPA⁺; and (□), TBA⁺ as the non-binding ions. (B), With TPA⁺ as the non-binding ion and: (△), Tris⁺; (o), Li⁺; (▽), Na⁺; (◇), NH₄⁺; and (□), K⁺ as the binding ions. The curved lines in (A) and (B) were calculated from Eq. (4) or (5), as described in the text, using the apparent K_D and cooperativity parameters given in Table 2.