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In situ Hybridization (ISH) is a powerful technique for precise detection and localization of a specific nucleic acid sequence within a histologic section. The underlying principle of ISH is that the nucleic acids within a histologic specimen can be detected by the hybridization of a complementary nucleic acid probe in which a reporter molecule is attached. Common non-radioactive labels for probe are fluorescein and digoxigenin. Subsequent visualization of the reporter molecule localizes DNA or RNA sequences in tissue or cells samples.