Conformational change in TER SL4 upon p65 xRRM2 binding. Free structure of SL4 of Tetrahymena TER (based on PDB ID 2FEY). Model of TER SL4 bound to p65 xRRM2. The model is based on p65 xRRM2 bound to TER S4 (PDB ID 4ERD), the loop 4 is taken from the solution structure (PDB ID 2M21) and placed on the distal stem 4.