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        Single-Copy and Point Mutation Analysis (Rolling-Circle PRINS)

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        This protocol is a prototype for a series of upcoming procedures aimed at the detection of single molecules of nucleic acids in situ . It uses circular probes that, upon hybridization to their target molecule, can template rolling-circle DNA synthesis, if the target also provides a primer for initiation of the DNA synthesis. This primer may be endogenous or artificial, for example, obtained through cleavage with a restriction enzyme. In this format, the primed in situ labeling (PRINS) product takes the form of a long-tandem repeat copy of the probe, covalently attached to the site of synthesis, and tagged it with copies of the probe. The amplification is sufficient for the detection of single, oligonucleotide size, targets and, depending on the probe format, the probe may detect variations in the targets down to single base substitutions.
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