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Figure 3. Stability of the polyelectrolyte multilayer films in saliva. (A) QCM measurements show no changes in -f/ for 1000 min in saliva, while the detergent totally removed the film in seconds (arrow). (B,C) CLSM vertical sections through a Pre-(PGA-PLL)₂₀-PGA-PLL^FITC film, after 48 hrs in 0.15 M NaCl (B) or in saliva (C). (D,E) Top view of a Pre-(PGA-PLL)₂₀-PGA-PLL^FITC film observed by fluorescent microscopy before (D) and after (E) 7 days in saliva. The film was scratched so that its integrity could be followed.

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