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Nature Cell Biology 9, 251–253 (1 March 2007) | doi:10.1038/ncb0307-251

Stressed marrow: FoxOs stem tumour growth

Paul J. Coffer & Boudewijn M. T. Burgering

What is the link between the nematode worm, cancer and blood cell homeostasis? The answer seems to be Forkhead box O (FoxO) transcription factors. Mammals express four distinct FoxO isoforms (FoxO1, FoxO3, FoxO4 and FoxO6) that are negatively regulated by protein kinase B (PKB; also known as c-Akt)-mediated phosphorylation.