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The bridging polymers polyallylamine, chitosan, gelatin, and polyethyleneimine were dissolved into MES buffer at 2.0% and the pH was adjusted to 6. The collagen was used as a stock solution (1.0%). 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC), sulfated or unsulfated N-hydroxysuccinimide (NHS) were used as the coupling reagents.   
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