Fig 2. Binding interface between complement FH19-20 (chain F, grey cartoon) and C3dg (chain C, light yellow surface).

Interface is shown from two directions about 180° apart with the interacting residues shown in ball-and-stick. The interface has 14 hydrogen bonds, marked using dashed lines between FH19 and C3dg. Residues in FH19 are italicised.