cDNA and derived amino acid sequences of the S. schenckii ssg-2 gene. Figure 1A shows the sequencing strategy used for ssg-2. The size and location in the gene of the various fragments obtained from PCR and RACE are shown. The black boxes indicate the size and relative position of the introns. Figure 1B shows the cDNA and derived amino acid sequence of the ssg-2 gene. Non-coding regions are given in lower case letters, coding regions and amino acids are given in upper case letters. The sequences that make up the GTPase domain are shaded in gray, the five residues that identify the adenylate cyclase interaction site are given in red and the putative receptor binding site is shown in blue.