The Rat Strain Ontology (RS) is currently being developed at the Rat Genome Database. For more information about this vocabulary or to request additions or changes, please contact us (http://rgd.mcw.edu/contact/index.shtml).
Conplastic strains are strains in which the nuclear genome from one strain has been introduced into the cytoplasm of another, either by backcrossing (in which the mitochondrial donor is always the female parent) or by direct nuclear transfer into an enucleated zygote.