急求文献三篇，谢谢亲们

20084720113

1.        Effect of exposure to interleukin-21 at various time points on human natural killer cell culture6 U# c7 f2 E9 T5 v( T8 R
链接：http://www.ncbi.nlm.nih.gov/pubmed/24950680
* q; e! L* g: S; K. I2.        Multiple effects of IL-21 on human NK cells in ex vivo expansion
4 K( [) W: F# M$ u- |7 p链接：http://www.ncbi.nlm.nih.gov/pubmed/25758713
6 \' [( }3 w; J, E9 n* n3.        Expansion of NK cells from PBMCs using immobilized 4-1BBL and interleukin-214 W7 P0 `  P1 d% s% ?
链接：http://www.ncbi.nlm.nih.gov/pubmed/259755332 G/ K1 p( j, Z7 k) k8 Z8 T: j

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20084720113

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