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Growth curves of clones of SW39 infected with pBabe puro vector, pBabe puro hTERT α-, pBabe puro hTERT β-, pBabe puro hTERT α-β- and pBabe puro hTERT WT All clones grow at the similar rates except at the end of their life-span, when the hTERT α- clones show increased apoptosis.
