The region surrounding the gene coding for the beta-polypeptide (21D-22C) of the major Drosophila melanogaster larval serum protein, LSP-1, has been studied in detail. Seven new gamma-ray-induced deficiencies of the region have been used, together with the two extant deficiencies, to map the position of the beta-gene and of the 55 newly induced ethyl methanesulfonate mutants uncovered by one of the largest deficiencies. No lethal mutation of the beta-gene was found.
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