PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 2242162-3 1990 We further present evidence that sim is required for midline expression of a group of genes including slit, Toll, rhomboid, engrailed, and a gene at 91F; that the sim mutant CNS defect may be largely due to loss of midline slit expression; and that the snail gene is required to repress sim and other midline genes in the presumptive mesoderm. sim 33-36 Toll Drosophila melanogaster 108-112