Fig. 4. Characterisation of the Arg240 binding site on MO25. (A) Structure showing the concave surface of MO25, in which the repeated Arg-Arg/His residues are labelled. (B-D) HEK293 cells were transfected with the indicated constructs and analysis performed as described in the legend to Fig. 1A. Results shown are the mean±s.d. of two independent assays carried out in triplicate.