Fig. 6.

Distribution of DNA loops on histone surface. (A) Diagram describing the relationship between $\theta$ and loops on the histone surface. (B) Distribution of loop positions for different DNA sequences. Loops are distributed unevenly on the histone surface, in a manner largely independent of DNA sequence. (C) Location of histone H4 tail. The H4 tail is colocalized with the location of DNA loops. (D) Molecular snapshot highlighting the role of the H4 tail in stabilizing DNA loops at $\theta \approx \pm \pi /2$, a position $\pm 20$ bp from the histone dyad.