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Southern hybridization with an oligonucleotide specific for cluster 9 LTRs with a panel of primate DNAs digested with EcoRI (see legend to Fig. 2 for abbreviations). To the left are sizes of the comigrating DNA size markers (in kilobases), and to the right an arrow indicates a hybridizing DNA fragment common to the gorilla, chimpanzee, and human within the 1.5- to 3.5-kb region indicated with a bracket. Fragments larger than 3.5 kb were too numerous to analyze.
