求英文文献两篇，谢谢！

zhusealin

1杂志：Stem Cells Dev. 2010 Nov;19(11):1713-22. doi: 10.1089/scd.2010.0014. Epub 2010 Sep 9.. e9 _& |& M8 d9 h- q
题目：Undifferentiated propagation of the human embryonic stem cell lines, H1 and HSF6, on human placenta-derived feeder cells without basic fibroblast growth factor supplementation., V- q. p& K+ Z  [5 V/ F0 Y+ J4 F8 F
作者：Park Y, Choi IY, Lee SJ, Lee SR, Sung HJ, Kim JH, Yoo YD, Geum DH, Kim SH, Kim BS.' `% O  O3 H( `  [7 f0 G$ J
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2杂志：Stem Cells Dev. 2007 Jun;16(3):421-8.# u( f( }  b5 w' i
题目：Human placenta-derived feeders support prolonged undifferentiated propagation of a human embryonic stem cell line, SNUhES3: comparison with human bone marrow-derived feeders.6 v# _% x% _) e* ?6 f
作者：Kim SJ, Song CH, Sung HJ, Yoo YD, Geum DH, Park SH, Yoo JH, Oh JH, Shin HJ, Kim SH, Kim JS, Kim BS.
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