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A neuropeptide F (NPF) was isolated from the fruit fly, Drosophila melanogaster, based on a radioimmunoassay for a gut peptide from the corn earworm, Helicoverpa zea. A partial sequence was obtained from the fly peptide, and a genomic sequence coding for NPF was cloned after inverse polymerase chain reaction and shown to exist as a single genomic copy. The encoded, putative prepropeptide can be processed...
We solve the isoperimetric problem for subsets in the set X * of binary sequences of finite length for two cases:(1) the distance counting the minimal number of insertions and deletions transforming one sequence into another;(2) the distance, where in addition also exchanges of letters are allowed.In the earlier work, the range of the competing subsets was limited to the sequences X n...
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