User:Jtwsaddress42/Projects/Project 2/Sections/Chapter 7/The Genetic Toolkits Guiding Epigenetic Behaviors - Topobiological Molecules, Morphogens, Transcription Factors, Structural & Regulatory Genes

Gerald Edelman surmised that there are three major types of genetic regulation associated with establishing the morphology of an animal:


 * Historegulatory genetic pathways - responsible for tissue-specific cell differentiation, specialization, and maintenance of basic cellular physiology and behavior.
 * Selector genes - responsible for determining tissue types via the activation or suppression of specific historegulatory gene pathways. (i.e. homeotic transcription factors, HOX genes, diffusable morphogens...)
 * Morphoregulatory genes - genes for the regulation of CAMs, SAMs, CJMs expression in a time- and place-dependent fashion.