Cationic guar gum (Jaguar® Excel; Mw = 1,000,000 − 1,500,000, degree of substitution = 0.10 − 0.13) [15 ] was kindly provided by Sansho Corporation (Tokyo, Japan). Boric acid (H3BO3), sodium hydroxide (NaOH), potassium chloride (KCl), sodium phosphate dibasic, potassium phosphate monobasic, sodium chloride (NaCl), Dulbecco’s modified Eagle’s medium (DMEM), penicillin-streptomycin-amphotericin B suspension (PSA-B), and fetal bovine serum (FBS) were purchased from Fujifilm Wako Pure Chemical Industries Ltd. (Osaka, Japan). Fibrin glue, Beriplast® P, was obtained from CSL Behring (Pennsylvania, United States).
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