1. Department
of Molecular Biophysics and Biochemistry, Yale University, 260
Whitney Avenue, New Haven, Connecticut 06520-8114, United States
2. Molecular
Targets Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, Maryland 21702-1201, United States
3. Basic
Science Program, Leidos Biomedical Research, Inc., Frederick National Laboratory, Frederick, Maryland 21702-1201, United States
4. Laboratorio
de Biotecnología Vegetal, Pontificia Universidad Católica del Ecuador, Quito 17 01 21 84, Ecuador