Conserved TDGs show co-expression in the Drosophila embryo. The figure shows in situ hybridization data for TDGs whose expression has not been previously described. Four genes from the Osiris cluster are expressed in the esophagus and in the ventral ectoderm, while three genes encoding Elongation-of-very-long-fatty-acids synthases (ELOVL) are expressed in the large intestine. We also found two undescribed genes that encode proteins with collagen-like repeats that are both expressed in a discrete domain at the anterior end of the syncitial blastoderm stage embryo, and two Ras-family members that show expression in the procephalon and ventral ectoderm. We have also found that the scrt Snail-type zinc finger gene has a conserved linked duplicate and both are expressed in overlapping domains in the central nervous system.