1. Department of NeurosciencesUniversity of California‐San DiegoCenter for Molecular GeneticsSchool of MedicineLa JollaCalifornia92093‐0634USA
2. National Institutes of Health, National HeartLung and Blood InstituteBethesdaMaryland20892USA
3. Department of BiochemistryKansas State UniversityManhattanKansas66506‐0402USA
4. Department of Human GeneticsUniversity of PittsburghMolecular Genetics LaboratoryPittsburghPennsylvania15261USA
5. Department of PathobiologyUniversity of WashingtonSchool of Public Health and Community MedicineSeattleWashington98195USA