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Bisbenzimide is an organic compound used as a fluorescent stain for DNA in molecular biology applications. Several bisbenzimides are used and are collectively called Hoechst stains.
Application
Bisbenzimides tend to bind to A-T rich regions of DNA and can decrease its density. Bisbenzimide mixed with DNA samples can then be used to separate DNA according to their AT percentage using a cesium chloride (CsCl) gradient centrifugation.
References
Bisbenzimide Wikipedia(Text) CC BY-SA