Human Anti-Whole Histones polyclonal antibody for ELISA. Histones are a group of similar, small, highly conserved nuclear proteins that bind to DNA by their many basic residues. The histones are divided into fractions, with each fraction having a distinct amino acid composition and sequence. Histones are also classified by relatively high levels of lysine and arginine. The presence of autoantibodies to histones are frequently found in several rheumatic disorders.