The mouse brain refers to the brain of Mus musculus. Laboratory mice are usually of the species "Mus musculus". The genome of the laboratory mouse "Mus musculus" was completed in 2002. Dystroglycan expression in Mus musculus brain and neural retina has also been reported. Homo sapiens, Rn for Rattus norvegicus, Mm for Mus musculus, or Dn for Danio rerio. Experiments are often conducted in the house mouse ("Mus musculus"). In most species, stop codon is TAA, and TGA in "Mus musculus". Some laboratory mouse strains such as C57BL/6 are domesticated from "Mus musculus domesticus". The classic model vertebrate is currently the mouse ("Mus musculus"). LCMV is naturally spread by the common house mouse, "Mus musculus". Its closest relative was the now extinct St Kilda house mouse ("Mus musculus muralis"). In mus musculus (house mouse), TRPV2 functions as a protein coding gene. The best known mouse species is the common house mouse ("Mus musculus"). Cumulina was a brown "Mus musculus" or common house mouse. The black rat ("Rattus rattus") and house mouse ("Mus musculus") have been introduced.