title: Homeotic genes, the homeobox, and the spatial organization of the embryo.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D004331:Drosophila melanogaster / Q000196:embryology* / Q000235:genetics; D005314:Embryonic and Fetal Development; D005786:Gene Expression Regulation; D005801:Genes, Homeobox; D007814:Larva / Q000033:anatomy & histology; D008969:Molecular Sequence Data; D009024:Morphogenesis; D012689:Sequence Homology, Nucleic Acid