[1] Univ Michigan, Mental Hlth Res Inst, Ann Arbor, MI 48109 USA
[2] Marshall Univ, Sch Med, Dept Microbiol Mol Genet & Immunol, Huntington, WV 25704 USA
[3] Inst Pasteur, ESR 572, Unite Virus Lents, F-75724 Paris, France
[4] Natl Inst Deafness & Other Commun Disorders, NIH, Rockville, MD 20850 USA