In a genus, a gene is the most important level at which a gene starts in a phenotype, e.g. The genetic information stored in the DNA represents the type of birth, and the result of the phenotype comes from the "translation" of that information. Such phenotypes are often expressed by the formation of proteins that regulate the formation and production of the body, or act as enzymes that kill specific body processes. Gene expression is the process by which information from a genome is used in the formation of a functional product of the genus. These products are usually proteins, but in non-protein-like forms such as RNA transfer (tRNA) or small RNA (snRNA), the product is functional RNA. Gene's speech is summarized in Central Dogma which was first developed by Francis Crick in 1958, continued to improve in his 1970 manuscript, and was expanded by subsequent discoveries of transcription and RNA replication.