Technicians observe the growth of umbilical cord blood stem cells at the base for national stem cell industry and product in Tianjin, north China, Aug. 29, 2009. Attended by 12 stem cell transplant centers of China, a national wide multi-center clinic research for umbilical cord blood stem cell transplant started here on Saturday. Tianjin now has the largest umbilical cord blood stem cell storage in the world. (Xinhua/Liu Haifeng)
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