Author Contributions
L.M.W. and E.D.T.W. designed the study. S.S., L.M.W., O.O.O., B.M.
S.P.F. and E.D.T.W. planned and performed experiments and collected and
analyzed data. M.K.M., B.M. and S.A.P. provided technical support and
cared for the mouse colony. S.S., L.M.W. and E.D.T.W. wrote the
manuscript, with input from all other authors. E.D.T.W. oversaw the
research.