Recombinant Histone Octamer (H3.1) - biotinylated consists of two molecules each of histones H2A that includes amino acids 1-130 (end) (accession number NM_003512), H2B that includes amino acids 1-126 (end) (accession number NM_003518), H3.1 that includes amino acids 1-136 (end) (accession number NM_003529) with a C-terminal Biotin tag, and H4 that includes amino acids 1-103 (end) (accession number NM_003548). It was generated in E. coli cells and has an observed molecular weight of 110 kDa.