Entirely replaces classical histone H2B prior nucleosome to protamine transition and probably acts as a nucleosome dissociating factor that creates a more dynamic chromatin, facilitating the large-scale exchange of histones ore component of nucleosome .Nucleosomes wrap and compact DNA into chromatin, limiting DNA accessibility to the cellular machineries which require DNA as a template.Histones thereby play a central role in transcription regulation, DNA repair, DNA replication and chromosomal stability .DNA accessibility is regulated via a complex set of post-translational modifications of histones, also called histone code, and nucleosome remodeling .Also found in fat cells, its function and the presence of post-translational modifications specific to such cells are still unclear.