[1] Univ Calif San Diego, Howard Hughes Med Inst, La Jolla, CA 92093 USA
[2] Univ Calif San Diego, Dept Neurobiol, La Jolla, CA 92093 USA
[3] Univ Calif San Diego, Dept Neurosci, La Jolla, CA 92093 USA
[4] NIDCR, Bethesda, MD 20892 USA
[5] St Louis Univ, Sch Med, Dept Biochem & Mol Biol, St Louis, MO 63104 USA