Ribbon diagrams of the major 3D structures of HATs generated with SWISS-MODEL. Green bars above the ribbon diagrams represent protein sequences with their corresponding amino acid lengths, and blue bars indicate the sequence areas where 3D structures were generated with SWISS-MODEL. Structures were color-coded ranging from the N-terminus (blue) to the C-terminus (red). ( A) TAFII250 family HATs from rice, maize and Arabidopsis. The SWISS-MODEL tool did not generate a 3D structure for the TAFII250 TBP-binding domain in AtHAF2. (B) GCN5 subfamily HATs. ( C) HAT1 subfamily HATs from rice, maize, Arabidopsis and soybean (Gm). The SWISS-MODEL tool did not generate a 3D structure for the GNAT domain in OsHAG704 and ZmHAG702. ( D) ELP3 subfamily HATs. ( E) MYST family HATs.