1Department of Molecular Biology, Massachusetts General Hospital, Boston, MA 02114, USA,
2Program in Immunology, Harvard Medical School, Boston, MA 02115, USA ,
3Department of Genetics, Harvard Medical School, Boston, MA 02115, USA
1Department of Molecular Biology, Massachusetts General Hospital, Boston, MA 02114, USA,
2Program in Immunology, Harvard Medical School, Boston, MA 02115, USA ,
3Department of Genetics, Harvard Medical School, Boston, MA 02115, USA
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Corresponding author:
Frederick M. Ausubel , Tel: +1-617-726-5969,