title: Cell competition: pirates on the tangled bank.
abstract: Competition by stem cells for occupation of a limited niche is a well-described phenomenon. Two recent studies highlight competition between hematopoietic stem cells based on p53. These findings have implications for both normal homeostasis and tumorigenesis.
authors.affiliation: St. Jude Children's Research Hospital, Memphis, TN 38105, USA. Electronic address: douglas.green@stjude.org.
authors.forename: Douglas R
authors.initials: DR
authors.lastname: Green