Abstract
A fast general purpose DNA handling program has been developed in BASIC and machine language. The program runs on the Apple II plus or on the Apple IIe microcomputer, without additional hardware except for disk drives and printer. The program allows file insertion and editing, translation into protein sequence, reverse translation, search for small strings and restriction enzyme sites. The homology may be shown either as a comparison of two sequences or through a matrix on screen. Two additional features are: (i) drawing restriction site maps on the printer; and (ii) simulating a gel electrophoresis of restriction fragments both on screen and on paper. All the operations are very fast. The more common tasks are carried out almost instantly; only more complex routines, like finding homology between large sequences or searching and sorting all the restriction sites in a long sequence require longer, but still quite acceptable, times (generally under 30 s).
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