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(A–C) Results of immunohistochemical staining in the CO, EC and HB groups after 2 weeks submuscular implantation. The numbers 1 and 2 represented CD31 and OCN staining, respectively. (D) was the average OD values calculated by the ratio of the integrated OD value to the stained area. (E) was the stained area proportion, and the scale bar was 50 μm.
