Once the mutation has been tagged, researchers use a nanotube tip resembling the needle on a record player to trace the physical shape of DNA and pinpoint the mutated regions. The nanotube creates a map showing the shape of the DNA molecule, including the tags identifying important mutations. Since the location of mutations can influence the effects they have on a cell, these techniques will be important in predicting disease.
![Nanotubes - Mapping Mutations](https://webarchive.library.unt.edu/eot2008/20081006130255im_/http://www.cancer.gov/images/Documents/59f950a6-9b9d-43ad-80a4-776cefdd17ce/cancer14.jpg)
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