Figure 4.—

Location, expression, and functional status of odorant binding proteins (Obps) in D. sechellia. The definitions of the symbols are at the bottom. Additional details can be found in Table 3. All genes were assayed using both the DGRC array and the Affymetrix GeneChip, unless otherwise indicated. With the exception of Obp99a and Obp99c, the gene expression differences were consistent between the DGRC and GeneChip. Gene models with minor differences among species are marked in yellow. Half of these differences from D. melanogaster are shared between D. simulans and D. sechellia, half are specific to D. sechellia, and none are specific to D. simulans. Among Obps, more than twice as many are less expressed in D. sechellia (nine) than in D. simulans (four) and several appear nonfunctional in D. sechellia. Chromosome images are from Lindsey and Zimm (1992).