FIG. 6.—

SCPs are expressed in fewer tissues than other protein-coding genes. (A) All protein-coding genes (orange) were far more likely to be expressed in all 20 tissues tested than genes harboring either SCLs (green) or PTCs (violet) and far less likely than either group of SCPs to be expressed in none of the tissues tested (inset chi-square test, P < 0.01 for all cases). (B) Gene harboring PTCs were more likely than other genes to be expressed at their highest level in the larval fat body and midgut but less likely in the ovary. None of the assayed tissues are significantly enriched for genes harboring SCLs compared with other genes.