Interstrain restriction fragments length polymorphism (RFLP) was detected after Southern blot hybridization of DNA from spontaneously hypertensive rats (SHR) and WKY rats treated with Bam HI restrictase with c-fos probe. The SHR genome is characterized by an additional miner band of 4.0 kilobase. RFLP was also revealed in c-src locus by Eco RI and Hind III restrictases. The major characteristic bands are 1.6 kb (SHR) and 2.4 kb (WKY) after Eco RI restriction and 3.4 kb (SHR) and 4.1 kb (WKY) after Hind III restriction. These RFLP can be used as mendelian traits in the linkage studies of distribution of blood pressure and other quantitative physiological traits in (SHR x WKY) F2 hybrids. The interstrain polymorphism determined in c-fos and c-src can also appear important in the evaluation of their physiological role in the cell.
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