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Optical images (A) hydrogel of 4b; (B) the solution obtained after adding a kinase to the gel of 4b; and (C) hydrogel of 4b formed by using phosphatase to treat 4a. (D)TEM images of the hydrogel of 4b formed by using phosphatase to treat 4a. (E) Optical image of the hydrogel formed subcutaneously 1 hour after injecting 4a into the mice. Adapted with permission from ref.19. Copyright ACS 2006.
