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A schematic of the odorant receptor gene structure and molecular polymorphisms in each Or gene region. (A) The genomic region is depicted with a solid line with black boxes representing exons and white boxes untranslated regions. The number of polymorphic markers in each region is depicted numerically either directly within the exons or in circles underneath. (B) For the chimeric Or22ab gene, the source of each exon is indicated by an “a” for Or22a or a “b” for Or22b.
