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We have selected from a mixture of random polynucleotides an RNA that is able to replicate in the presence of the DNA-dependent RNA polymerase of Escherichia coli, provided the medium contains Mn(2+) and ITP, in addition to ATP, CTP, and UTP. The RNA consists of a chain of about 125 (+/-25) nucleotides and appears to have a defined, nonrepetitive sequence.

An RNA that Multiplies Indefinitely with DNA-Dependent RNA Polymerase: Selection from a Random Copolymer