title: Cell proliferation without cyclin E-CDK2.
abstract: In this issue of Cell, Geng et al. report that mice can undergo embryonic development without cyclins E1 and E2. Fibroblasts derived from the double knockout embryos proliferate normally in culture. However, E type cyclins seem essential for endoreplication and exit from quiescence.
authors.affiliation: Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724, USA.
authors.forename: Juan
authors.initials: J
authors.lastname: Méndez
mesh_terms: D000818:Animals; D042846:CDC2-CDC28 Kinases; D002453:Cell Cycle / Q000502:physiology*; D019925:Cyclin A / Q000378:metabolism; D019927:Cyclin E / Q000235:genetics / Q000378:metabolism*; D051357:Cyclin-Dependent Kinase 2; D018844:Cyclin-Dependent Kinases / Q000235:genetics / Q000378:metabolism*; D005347:Fibroblasts / Q000502:physiology; D006801:Humans; D051379:Mice; D018345:Mice, Knockout; D017346:Protein Serine-Threonine Kinases / Q000235:genetics / Q000378:metabolism*
chemical_list: D019925:Cyclin A; D019927:Cyclin E; D017346:Protein Serine-Threonine Kinases; D042846:CDC2-CDC28 Kinases; C495894:CDK2 protein, human; C495893:Cdk2 protein, mouse; D051357:Cyclin-Dependent Kinase 2; D018844:Cyclin-Dependent Kinases