求文献两篇，谢谢！

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1  杂志：Differentiation. 2012 Jan;83(1):92-100. doi: 10.1016/j.diff.2011.09.003. Epub 2011 Oct 19.1 K' y2 S% P8 w3 m: F% V: ^9 G
    题目： New culture system for human embryonic stem cells: autologous mesenchymal stem cell feeder without exogenous  fibroblast growth factor 2.( N; l9 ?: O3 E. F, U% D
    作者：Lee EJ, Kang HJ, Lee HN, Kang SK, Kim KH, Lee SW, Lee G, Park YB, Kim HS.
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2 S9 I4 S/ \9 p3 X/ i) b& i2  杂志：Tissue Eng Part C Methods. 2012 May;18(5):387-96. Epub 2012 Jan 26.5 t. k6 K* Y, }/ Q
    题目：Maintenance of human embryonic stem cells in media conditioned by human mesenchymal stem cells obviates the requirement of exogenous basic fibroblast growth factor supplementation.* b, Z0 e% g4 K! Q6 @* y# F2 F
    作者：Sánchez L, Gutierrez-Aranda I, Ligero G, Martín M, Ayllón V, Real PJ, Ramos-Mejía V, Bueno C, Menendez P.( @2 R5 J- u, Z5 ?
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