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Recombinant Inbred Strains (RIS) are a set of inbred strains that are produced by intercrossing two progenitor strains followed by intercross inbreeding of their progeny for at least 20 generations. The panel consists of strains in which various random combinations of parental genomes are fixed. [Color figure can be viewed in the online issue, which is available at www.interscience.wiley.com.]
