C-terminal acidic domain of histone chaperone human NAP1 is an efficient binding assistant for histone H2A-H2B, but not H3-H4.
Ohtomo H, Akashi S, Moriwaki Y, Okuwaki M, Osakabe A, Nagata K, Kurumizaka H, Nishimura Y. Genes Cells. 2016 Mar; 21(3):252-63. Epub 2016 Feb 4.