Authors: Rita Sousa-Nunes; Amer Ahmed Rana; Ross Kettleborough; Joshua M Brickman; Melanie Clements; Alistair Forrest; Sean Grimmond; Philip Avner; James C Smith; Sally L Dunwoodie; Rosa S P Beddington Journal: Genome Res Date: 2003-11-12 Impact factor: 9.043