[1] MIT, Div Comparat Med, Cambridge, MA 02139 USA
[2] Aristotle Univ Thessaloniki, Fac Vet Med, Pathol Lab, GR-54006 Thessaloniki, Greece
[3] Yale Univ, Sch Med, Dept Neurol, New Haven, CT 06510 USA
[4] Yale Univ, Sch Med, Dept Immunobiol, New Haven, CT 06510 USA
[5] MIT, Broad Inst, Cambridge, MA 02139 USA
[6] Harvard Univ, Cambridge, MA 02138 USA
[7] Tech Univ Dresden, Fac Med, Dresden, Germany