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Biocompatibility of GGH. a) Inverted fluorescence microscope images of L929 fibroblasts after incubation for 3 and 5 d (bar = 100 μm). b) CCK-8 assay about the cytotoxicity of GGH to L929 fibroblasts after incubation for 1, 3 and 5 d. c) Images of subcutaneous tissues around the injection site of GGH at different times after subcutaneous injection (bar = 1 cm). d) H&E staining of GGH at different times (upper bar = 500 μm, bottom bar = 50 μm).
