Electrostatic potential surfaces of SECRET (A), vCCI (B) and A41 (C). Upper panel shows chemokine-binding surfaces formed by β-sheets II of corresponding molecules. Lower panel shows the same molecules rotated around y-axis by 180°. Electrostatic potential was calculated with DelPhi software . Negatively charged area is coloured in red and blue colour indicates positive electrostatic charge. Image was produced using PyMOL .