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Correspondence: Hui-Kuo G. Shu; Email: hgshu@emory.edu (HGS) and Hyunsuk Shim; Email: hshim@emory.edu (HS)
Authors' Contributions: Conceived and designed the experiments: HGS, MR and HS.
Performed the experiments: HGS, YY, SH, KX, HG, ETG, CN and MR.
Analyzed the data: HGS, YY, SH, MR, HS and CH.
Contributed reagents/materials/analysis tools: HGS, MR and HS.
Wrote the manuscript: HGS and HS.
Acknowledgments: We thank Jessica Paulishen for careful reading of the manuscript and helpful remarks.
Disclosures: The authors have declared that no competing interests exist.
This work was supported in part by the National Institutes of Health grants RC1AI081273 and R21HL092518 (to HGS and HS).
© 2013 Shu et al.