... residues of D3 and B contribute to thestability of t he dimer. The first c luster includes F70/V336 and I72/Q338 ( both in b5 s trand) of D3 and F 27/Y289(b2 strand), L67/M324, V70/I327 and L72/L328 ... b5 strand) of D3 and I41/L304,C43/A306 ( both in b3), L69/S326 and L71/L328 (both inb4) of B. Stacking interactions between guanidinium groups of arginines R69/V335 of D3 and R25/G287 and R49/T312 of ... b4strand) of B. The second cluster c onsists of P6/M267, L10/L271 (both i n a-helix), V18/C279 (b1 s trand), L32/F293 (b2strand), I33/K294 (loop after b2 strand), I68/F334, L71/V337 and L73/F339...