About the Authors

Frances Crawford

Affiliations Howard Hughes Medical Institute, Integrated Department of Immunology, National Jewish Medical and Research Center, Denver, Colorado, United States of America, Integrated Department of Immunology, University of Colorado Health Science Center, Denver, Colorado, United States of America

Eric Huseby

Affiliations Howard Hughes Medical Institute, Integrated Department of Immunology, National Jewish Medical and Research Center, Denver, Colorado, United States of America, Integrated Department of Immunology, University of Colorado Health Science Center, Denver, Colorado, United States of America

Janice White

Affiliation Howard Hughes Medical Institute, Integrated Department of Immunology, National Jewish Medical and Research Center, Denver, Colorado, United States of America

Philippa Marrack

Affiliations Howard Hughes Medical Institute, Integrated Department of Immunology, National Jewish Medical and Research Center, Denver, Colorado, United States of America, Integrated Department of Immunology, University of Colorado Health Science Center, Denver, Colorado, United States of America, Department of Biochemistry and Molecular Genetics, University of Colorado Health Science Center, Denver, Colorado, United States of America

John W Kappler

To whom correspondence should be addressed. E-mail: kapplerj@njc.org

Affiliations Howard Hughes Medical Institute, Integrated Department of Immunology, National Jewish Medical and Research Center, Denver, Colorado, United States of America, Integrated Department of Immunology, University of Colorado Health Science Center, Denver, Colorado, United States of America, Department of Pharmacology and the Program in Biomolecular Structure, University of Colorado Health Science Center, Denver, Colorado, United States of America

Competing Interests

The authors have declared that no conflicts of interest exist.

Author Contributions

FC and JWK conceived and designed the experiments. FC, EH, JW, and JWK performed the experiments. JWK and PM wrote the paper