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The sequence organization in the DNA of chicken (Gallus domesticus) was studied using hydroxyapatite-monitored reassociation kinetics. DNA 320-nucleotides long reassociates as though it is composed of three components, i.e., a very rapidly reacting fold-back fraction, a component composed of sequences repeated an average of 640 times in the genome, and a large unique fraction representing about 80% of the genome. The sizes of the fold back and repeated components increase only moderately with large increases in fragment size, indicating that these sequences are not extensively interspersed in the genome. Even at a fragment size of 4500 nucleotides, the unique component represents 68% of the DNA. Thus, the chicken genome is not organized in the short-period (Xenopus) interspersion pattern described for a large number of other organisms; rather, the DNA-sequence organization of this vertebrate bears more resemblance to the long-period interspersion pattern of Drosophila.
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