1. Department of Genetics University of North Carolina Chapel Hill NC 27599‐3280USA
2. SPIRE Postdoctoral Fellowship Program University of North Carolina Chapel Hill NC 27599‐3280USA
3. Department of Biology University of North Carolina Chapel Hill NC 27599‐3280USA
4. Department of Natural Sciences Fayetteville State University Fayetteville NC 28301‐4298USA
5. Department of Neuroscience Institut Pasteur 75724 Paris Cedex 15 France