求助文献一篇，谢谢！

2005150122

连接：http://www.ncbi.nlm.nih.gov/pubmed/21492411
$ n& O6 P4 B1 ~4 O% ~. h' ^3 \; e标题：Ex vivo amplification of human hematopoietic stem and progenitor cells in an alginate three-dimensional culture system6 z& y5 B$ A) \  F3 J1 |
谢谢！