Fig. 2.

Unit cell lengths at increasing divalent salt concentrations. (A–F) Modified (A, C, and E) and native (B, D, and F) lipid compositions’ unit cell length at increasing CaCl₂ (A and B), ZnCl₂ (C and D), and MgCl₂ (E and F) concentrations from 0 to 15 mM. The transition concentrations (C*) are marked with the vertical black dotted lines. The black squares represent the dominant lamellar phase ($d_L$), the purple hexagonal symbols represent the inverse hexagonal phase ($a_H$), and the red squares represent the dense lamellar phase ($d_d$) for all ion types. The additional lamellar phase in the presence of 2 and 15 wt% MBP are denoted as d_MBP (half-filled orange squares).