Department of Molecular & Cell Biology, Division of Immunology & Pathogenesis, University of California, Berkeley, California, USA.
Janelle S Ayres,
Norver J Trinidad &
Russell E Vance
J.S.A. and R.E.V. conceived of the study, designed experiments and wrote the manuscript. J.S.A. directed the study and performed all experiments. N.J.T. did all mouse intravenous injections and performed the retroviral lethality assay.
Competing financial interests
The authors declare no competing financial interests.