In a broad variety of bilaterian species the trunk central nervous system (CNS) derives from three primary rows of neuroblasts. The fates of these neural progenitor cells are determined in part by three conserved transcription factors: vnd/nkx2. 2. ind/gsh and msh/msx in Drosophila melanogaster/vertebrates. https://www.roneverhart.com/Medline-Remedy-Phytoplex-Z-Guard-Skin-Protectant-Paste-Scented/