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Immunohistochemistry staining of CD31 at 2 weeks (*200). (a) The 1 : 1 P/L ratio of CPC-FG; (b) 1 : 0.5 P/L ratio of CPC-FG; (c) 1 : 2 P/L ratio of CPC-FG; (d) pure CPC. The yellow star was represented as the materials and the black star was surrounding muscle tissue. The red arrow was the CD31 staining of new blood vessel.
