Abstract
Renatured repetitive human DNA sequences have been fractionated according to three criteria: length, thermal stability, and rate of renaturation. Satellite sequences are found in the long repetitive sequence fractions and renatured satellite sequences are well base paired by the criterion of thermal stability. No satellites are observed in short repeated sequences. Short repeated sequences are interspersed with single copy sequences and are poorly base paired. This implies satellite components are relatively homogeneous in base sequence whereas short interspersed repeated sequences are inexact copies of each other. A method for isolating satellite DNAs based on their high thermal stabilities is discussed.
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