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ALP staining observation of each group after osteogenic induction cultured for 10 days (×100)
成骨诱导培养 10 d 各组 ALP 染色观察（×100）
a. 空白组；b. 对照组；c. IL-4 组；d. BMP-2 组；e. IL-4+BMP-2 组
a. Blank group; b. Control group; c. IL-4 group; d. BMP-2 group; e. IL-4+BMP-2 group
