Cyclin D 3 Compensates for Loss of Cyclin D 2 in Mouse B-lymphocytes Activated via the Antigen Receptor and CD 40 *

Eric W.-F. Lam, Janet Glassford, Lolita Banerji, N. Shaun B. Thomas, Piotr Sicinski, and Gerry G. B. Klaus From the Ludwig Institute for Cancer Research and Section of Virology and Cell Biology, Imperial College School of Medicine at St Mary’s, Norfolk Place, London W2 1PG, the Department of Haematology, Royal Free and University College Medical School, 98 Chenies Mews, London WC1E 6HX, United Kingdom, the Dana-Farber Cancer Institute and Department of Pathology, Harvard Medical School, Boston, Massachusetts 02115, and the Division of Cellular Immunology, National Institute for Medical Research, Mill Hill, London NW7 1AA, United Kingdom