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Genomic structure of frq1 and frq2 genes in Drosophila melanogaster. Schematic representation of the genomic region encompassing frq1 and frq2 in the Drosophila melanogaser X chromosome. Red and grey boxes indicate coding and non-conding exons, respectively. Arrow head indicates direction of transcription with respect to the centromere which is at the right. The small gene Andorra (and) is located between the two frq genes.
