Figure 2

Initial models of interaction between Ca2+ and (a) PAA, (b) HPMA, (c) PESA, and (d) PASP. (Red - O atom; white - H atom; gray - C atom; dark blue - N atom; green: Ca atom).
Initial models of interaction between Ca2+ and (a) PAA, (b) HPMA, (c) PESA, and (d) PASP. (Red - O atom; white - H atom; gray - C atom; dark blue - N atom; green: Ca atom).