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Characteristics of CAT and CAT-PEG. (A) HPLC of CAT and CAT-PEG; (B) TEM image of CAT-PEG; (C) DLS and (D) zeta potential of CAT and CAT-PEG; (E) The enzyme activity and (F) proteolytic stability of CAT and CAT-PEG. n = 3. Data represent means ± s.e.m. ***p＜0.001. ns means not significant.
