title: H2AFB2
text: # H2AFB2
  
  Histone H2A-Bbd type 2/3 also known as H2A Barr body-deficient is a histone protein that in humans is encoded by the H2AFB2 gene (H2A histone family, member B1).
  
  ## Function
  
  Histones are basic nuclear proteins that are responsible for the nucleosome structure of the chromosomal fiber in eukaryotes. Nucleosomes consist of approximately 146 bp of DNA wrapped around a histone octamer composed of pairs of each of the four core histones (H2A, H2B, H3, and H4). The chromatin fiber is further compacted through the interaction of a linker histone, H1, with the DNA between the nucleosomes to form higher order chromatin structures. This gene encodes a member of the histone H2A family. This gene is part of a region that is repeated three times on chromosome X, once in intron 22 of the F8 gene and twice closer to the Xq telomere. This record represents the middle copy.
  
  