Human cells can copy not only DNA, but also RNA

Single-molecule sequencing technology has detected and quantified novel small RNAs in human cells that represent entirely new classes of the gene-translating molecules, confirming a long-held but unproven hypothesis that mammalian cells are capable of synthesizing RNA by copying RNA molecules directly. The findings were reported in Nature by researchers from the University of Pittsburgh School of Medicine, Helicos Biosciences Corp., Integromics Inc., and the University of Geneva Medical School.

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