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A program for assembling sequences by using a global approach has been developed. By successive steps, a more and more precise classification of DNA fragments permits the positioning of the sequences on the contig; after having detected the pairs of overlapping sequences, groups are formed such that all sequences in a group overlap. Sequences common to several groups enable the groups to be ordered in a series. Ambiguities in the order of groups can arise at this stage, due to the presence of repeated fragments; different solutions are then proposed. Putting the groups into order leads to a preclassification of sequences. The fragments are then aligned by group, by searching for words common to all sequences in the group, and using an algorithm of dynamic programming. A detailed example on a set of nine sequences accompanies the description of the method.
Gleizes et al. (Sat,) studied this question.
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