求两篇英文文献，谢谢！

zhusealin

1杂志：Stem Cells Dev. 2010 Nov;19(11):1713-22. doi: 10.1089/scd.2010.0014. Epub 2010 Sep 9.3 G7 G# j: N# `% G& a+ q; w. i
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.0 {# o( h& p& L( V
作者：Park Y, Choi IY, Lee SJ, Lee SR, Sung HJ, Kim JH, Yoo YD, Geum DH, Kim SH, Kim BS.
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4 g: @; y- s& ^' I7 {2杂志：Stem Cells Dev. 2007 Jun;16(3):421-8.
; `( ~4 X: |6 Y2 N% a# R+ ?6 F5 `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.
( j' q7 G# m7 b  s' K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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