Supplementary information

From the following article:

Tumour biology:  Senescence in premalignant tumours

Manuel Collado, Jesús Gil, Alejo Efeyan, Carmen Guerra, Alberto J. Schuhmacher, Marta Barradas, Alberto Benguría, Angel Zaballos, Juana M. Flores, Mariano Barbacid, David Beach & Manuel Serrano

Nature 436, 642(4 August 2005)

doi:10.1038/436642a