Abstract
Four molecular clones containing DNA homologous to the Rous sarcoma virus transforming gene ( src) have been isolated from a random library of normal chicken DNA. The four clones are distinct overlapping isolates, which together span approximately 33 kb of cellular DNA. The cloned locus appears to represent the major region of chicken DNA homologous to src, since src-containing restriction fragments of this locus account for the fragments detected by hybridization of src-specific probe to restriction digests of total chicken DNA. Analysis of the cloned chicken src locus by restriction and heteroduplex mapping indicates that the locus contains 1.6-1.9 kb of DNA homologous to the viral src gene. The chicken DNA sequences homologous to viral src are interrupted by five or six nonhomologous regions, totaling approximately 6 kb, which presumably represent introns in the cellular src gene.
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