Fig. 1. Schematic representation of the regions of GspF and GspM analysed in the yeast two-hybrid system. Schematic representation of the regions of GspF and GspM that have been fused at their N-terminus either to LexA or to the B42 activation domain. The number next to the boxes indicates the position of the residues that defined the domain studied. Hatched box, transmembrane region.