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ATR-IR spectra of adsorbed a) mfp3S-pep-3Dopa and b) mfp3S-pep-3Dopa coacervate on HAP from 0.1 mg mL−1 solutions recorded at ≈2 min intervals. Backgrounds were from (a) 100 × 10−3m acetic acid and (b) buffer at pH 6.5 and 100 × 10−3m ionic strength on HAP-coated ZnSe prism.