Genomic DNA from the silk moth Antheraea pernyi bearing the gene of a pheromone binding protein has been isolated from a partial genomic library using specific cDNA probes. The DNA spans 3.5 kilobases, contains three exons and two intervening sequences that interrupt the protein coding region of the gene. A DNA fragment of a second gene was isolated and the complete primary structure of a corresponding cDNA clone was unravelled. The expression of two different genes, giving rise to different pheromone binding proteins, implies a more specific function of these proteins than was hitherto assumed.
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