title: Author's reply.
authors.affiliation: Department of Stomatology and the Department of Biochemistry and Molecular Medicine, Université de Montréal, P. O. Box 6128 Station Centre-Ville, Montreal, Québec H3C 3J7, Canada.
authors.forename: Elitza I
authors.initials: EI
authors.lastname: Tocheva
authors.affiliation: Howard Hughes Medical Institute; Department of Biology and Biological Engineering, California Institute of Technology, 1200 East California Boulevard, Pasadena, California 91125, USA.
authors.forename: Davi R
authors.initials: DR
authors.lastname: Ortega
authors.affiliation: Howard Hughes Medical Institute; Department of Biology and Biological Engineering, California Institute of Technology, 1200 East California Boulevard, Pasadena, California 91125, USA.
authors.forename: Grant J
authors.initials: GJ
authors.lastname: Jensen