Functional Domains of H2A/H2B histone chaperones and replication-associated chaperones. Each diagram displays a scaled representation of the domain structure for NAP proteins SET and NAP1L1 (A), SPT16 (B), SSRP1/Pob3 (C), NHP6 (D), MCM2 (E), PolE3 (F) from Physarum, yeast, human and Arabidopsis. Each domain is depicted at its position by a different color and the code is indicated at the right. Names of domains involved in histone binding are in bold and underlined. HMG, High-Mobility Group; IDD and ID, Intrinsically DisorDered; HBD, histone binding domain; OB-fold, oligonucleotide/oligosaccharide-fold; AAA+, ATPase activity.