The following statements are made with reference to the structure of the nucleosome:

A. The histone tetramer in the core of the nucleosome comprises H2A, H2B, H3 and H4.

B. The N‐terminal tails of the core histones are believed to stabilize the 30 nm fiber of nucleosomal DNA by their interactions with adjacent nucleosomes.

C. The post‐translational modifications of the N‐terminal tails as well as globular domains of the core histones modulate transcriptional events

D. According to the zigzag model of the 30 nm fiber the linker DNA circles around the central axis of the fiber as the DNA moves from one nucleosome to the next.

Which of the following combinations represents all correct statements