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Rewritable DNA for digital data storage - Researchers in the US have engineered DNA in a living cell to act as a rewritable memory storage module. This can form the basis of a digital memory system, the scientists suggest, with the cell being able to 'record' transient changes in its internal chemistry. If multiple DNA switches could be operated simultaneously, each responding to a different set of inputs, complex cellular processes, such as differentiation or cancer development, could tracked simply using a few DNA switches. Reference: J Bonnet et al, Proc. Nat. Acad. Sci. USA, 2012, DOI: 10.1073/pnas.1202344109