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SlideshowReport

Chromosome structural changes that accompany dihydrofolate reductase gene amplification

Description
The micrograph shows metaphase chromosomes from Chinese hamster ovary cells that are highly resistant to methotrexate.

Chromosomal DNA was subjected to hybridization in situ with a fluorescence-labeled DHFR gene probe.

White arrows point to single-copy genes.

The amplified chromosomal sequences are on a giant form of the chromosome that also contains one of the original single-copy sequences.
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