H2BC5 (Histone Cluster 2, H2bc5): H2BC5 is a protein that belongs to the histone H2B family. These proteins play crucial roles in packaging and organizing DNA within the nucleus of eukaryotic cells. H2BC5 helps form nucleosomes, the fundamental repeating units of chromatin, where DNA is wrapped around a core of histone proteins. Through various modifications, H2BC5 and other histones regulate gene expression, DNA replication, and repair, contributing to the dynamic structure and function of chromosomes.