求助一篇早年的文献，谢谢！

zsutx2005

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Characterization and expression of recombination activating genes (RAG-1 and RAG-2) in Xenopus laevis.
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J Immunol 1993 151:3100-10
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http://www.jimmunol.org/content/151/6/3100.abstract
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franklinhg