1. Department of Biochemistry and Molecular Genetics, University of Colorado School of Medicine
2. Department of Biology, University of Texas at Arlington
3. Present address: Key Laboratory of Child Development and Learning Science, Southeast University, Ministry of Education, Nanjing, People's Republic of China
4. Department of Botany and Plant Pathology, Oregon State University
5. Instituto de Biologia, Universidad de Antioquia, Medellin, Colombia