title: Response to 'Secreted IgM versus BLyS in germinal center formation'
authors.affiliation: Department of Molecular Oncology, Genentech Inc., 1 DNA Way, South San Francisco, CA 94080, USAaa@gene.com and aa@gene.com
authors.initials: A
authors.lastname: Ashkenazi
authors.initials: IS
authors.lastname: Grewal
authors.initials: VM
authors.lastname: Dixit