1. Oral and Pharyngeal Cancer Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD 20852, USA.
2. Department of Biochemistry, Institute for Research in Immunology and Cancer, Université de Montréal, Montréal, Québec H3C 3J7, Canada.
3. Intracellular Membrane Trafficking Unit, Oral and Pharyngeal Cancer Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD 20852, USA.