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Immunofluorescence staining for CD31 in each group at 7 and 28 days postoperatively (Laser confocal microscope×60)
术后7、28 d各组CD31免疫荧光染色观察（激光共聚焦显微镜×60）
箭头示新生血管，从左至右依次为A、B、C、D组 a. 术后7 d；b. 术后28 d
Arrow showed angiogenesis; from left to right for groups A, B, C, and D, respectively a. At 7 days postoperatively; b. At 28 days postoperatively
