iview rendering of the CCR5 chemokine receptor-HIV entry inhibitor maraviroc complex  (PDB code: 4MBS), with protein surface enabled. The human CCR5 is rendered as molecular surface colored by chain. The marketed HIV drug maraviroc is rendered as stick colored by chain. It can be clearly seen that the crystal structure consists of two complexes, and the CCR5 forms a deep allosteric cavity where maraviroc is buried. This figure can be reproduced at http://istar.cse.cuhk.edu.hk/iview/?4MBS.