FIGURE 7.

A, ¹⁹F-MRI signals of C₇-Glu₂ and C₇-Glu₃ (2 mM) upon titration of CaCl₂. B, Signal reduction is observed for C₇-Glu₂ and C₇-Glu₃ in response to decreasing Ca²⁺ concentrations. Each image is 1.8 × 1.8 cm². In the figure C₇-Glu₂ and C₇-Glu₃ are labeled as C₇E₂ and C₇E₃, respectively. Adapted with permission from ACS Appl. Mater. Interfaces 2017, 9, 46, 39890. Copyright © 2017 American Chemical Society