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A non-radioactive in situ hybridization technique is described which allows the simultaneous detection of different DNA sequences. To demonstrate the feasibility of the procedure, metaphases and interphase nuclei of a human-mouse somatic cell hybrid were simultaneously hybridized with mercurated total human DNA and a biotinylated mouse satellite DNA probe. After the hybridization, the probes were detected immunocytochemically using two different and independent affinity systems. By this approach we visualized the two DNA target sequences in metaphase chromosomes and in interphase nuclei with FITC and TRITC fluorescence, or blue (alkaline phosphatase) and brown (peroxidase) precipitated enzyme products. This method not only allows detection of intact chromosomes but also the visualization of rearrangements between parts of human and mouse chromosomes. Furthermore, the technique demonstrates the high topological resolution of non-radioactive in situ hybridizations.
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