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Exon mapping by fiber-FISH or LR-PCR.

In this study we systematically assessed the sensitivity limits of fiber-FISH in model experiments. Exonic fragments and cDNAs with exon sizes of >/=200 bp could be mapped on their cognate cosmid. This positional fiber-FISH mapping was validated by long-range PCR. It is expected that these two independent mapping approaches will help to refine current available gene maps and show their applicability in fine mapping of sequence-tagged sites or expressed sequence tags. Also, they will be useful in resolving gene structures by mapping exon and intron locations.