求一篇PNAS文章，多谢，附链接

jiojoo

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# W* Y8 o( N% h* v. k7 ^http://www.pnas.org/content/108/23/9466
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1 _! P: d5 u4 Q# _& ZIntegrin activation and internalization on soft ECM as a mechanism of induction of stem cell differentiation by ECM elasticity
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