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 9.9 R5 M2 C+ H  `. j; C
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.- w' m+ Z$ h0 B0 X* ?
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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( o0 b2 N2 Y+ z6 |8 _- L- Z% u2杂志：Stem Cells Dev. 2007 Jun;16(3):421-8., U3 V  j/ D# G4 S5 ]3 R
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.2 z! I6 s. t6 [  U6 E6 g
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.2 S& @4 T# \# Y3 T9 R