[1] Karolinska Inst, MBB, Mol Neurobiol Unit, S-17177 Stockholm, Sweden
[2] Univ Montpellier 2, CNRS, INSERM, U432, Montpellier, France
[3] Karolinska Inst, Dept Physiol & Pharmacol, S-17177 Stockholm, Sweden
[4] Univ Michigan, Sch Dent, Dept Biol & Mat Sci, Lab Oral Neurobiol, Ann Arbor, MI 48109 USA