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Abstract：
The program described allows for the creation and manipulation of files of DNA sequence data up to very great lengths. The program uses its own paging system to load segments of the sequence into a small internal buffer so that the program does not have excessive memory requirements. The program offers a menu of functions to the user, and has been written to be forgiving of user errors. A code for the generalised specification of bases as a series of groups (i.e. A or T, Purine, etc.) has been devised and can be used in search specifications or in sequence files. Versions of the program have been developed to run with special efficiency under DIGITAL\'s RT11 operating system or to run under systems with a suitable implementation of FORTRAN VI.
摘要：
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