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Cell. 1975 Nov;6(3):345-58.

Sequence organization of the human genome.


The organization of three sequence classes--single copy, repetitive, and inverted repeated sequences--within the human genome has been studied by renaturation techniques, hydroxylapatite binding methods, and DNA hyperchromism. Repetitive sequence classes are distributed throughout 80% or more of the genome. Slightly more than half of the genome consists of short single copy sequences, with a length of about 2 kb interpersed with repetitive sequences. The average length of the repetitive sequences is also small and approximates the length of these sequences found in other organisms. The sequence organization of the human genome therefore resembles the sequence organization found in Xenopus and sea urchin. The inverted repeats are essentially randomly positioned with respect to both sequence class and sequence arrangement, so that all three sequence classes are found to be mutally interspersed in a portion of the genome.

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