地点与材料：研究地点为郑州大学医学院干细胞研究中心。
SETTING and MATERIALS: the research was done in the Stem Cell research Center in the Medical College of Zhengzhou University.
地点与材料：研究地点为郑州大学医学院干细胞研究中心。
SETTING and MATERIALS: the research was done in the Stem Cell research Center in the Medical College of Zhengzhou University.
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