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Letter

Nature Cell Biology 5, 535–538 (1 June 2003) | doi:10.1038/ncb992

Proliferative lifespan is conserved after nuclear transfer

A. John Clark , Patricia Ferrier , Samena Aslam , Sarah Burl , Chris Denning , Diana Wylie , Arlene Ross , Paul de Sousa , Ian Wilmut & Wei Cui

Cultured primary cells exhibit a finite proliferative lifespan, termed the Hayflick limit. Cloning by nuclear transfer can reverse this cellular ageing process and can be accomplished with cultured cells nearing senescence.