Histone H2A

**Semantic type:** Amino Acid, Peptide, or Protein

**Definition:** Slightly lysine rich histone. One of four histones assembled into a nucleosomal core octamer. Various posttranslationally modified forms and variants exist. Combines with histone H2B in a heterodimer; two H2A/H2B dimers are incorporated in the nucleosomal octamer.

**Synonyms:** - H2A - H2A - HIST1H2A - HISTONE H2A - Histone 2A