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Phred and Phrap

Phred is a popular program which converts raw sequence (chromatogram) into the strings of Gs, As, Ts, and Cs which are easy to store and work with. A related program is Phrap, which helps assemble short DNA sequences into longer ones.

For more about these programs see: http://www.phrap.com/

However, using these programs requires a bit of experience. Depending on the type of sequencer that you use, there may be other, more user-friendly programs available to you from your institution.