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5.2.1.4. Quaternary structure of DNA

Quaternary structure of DNA

When the nucleosome fiber 100 Å or chromatin folds back on itself, achieves higher Structurally, the fiber chromatin of 300 Å, with which they adopt two possible structures:

  • In the solenoid model (the most likely) the DNA is helically wound (300 nm fiber), with six nucleosomes in each turn, shortening the length of the 100 Å nucleosomal fiber by five times.
  • In the superball model (the least likely), the fiber is formed by a union of balls that each contain twelve nucleosomes.