Fig. 2. CD spectra, showing mean residue ellipticity, θ, versus wave length for 0.1 mM peptides solutions with different FD-RGD mol% (A) and with 20 mM Ca²⁺ (B). The dashed grey lines mark the negative peaks at 204 and 218 nm. (C) θ at 218 nm (attributed to β-sheet) as function of FD-RGD mol%.