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一种是大家熟知的脐带血干细胞，婴儿生下来之后保存脐带血，目前的研究进展来看，脐带血干细胞只能支持一个30公斤体重的人，如果成年人有需要，在现有条件下是难以支撑生长发育和治疗的；尼日尔西部与马里接壤，两国边界线约800公里，该地区生活着图阿雷格人、富拉尼人等主要部族。近几个月来，两国边境地区部族冲突和袭击事件有所增加，地区安全面临威胁。
【文/观察者网】中美贸易战不打了，下一步要怎么办？
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