Table 1. An E. coli gene is counted as `present' in a particular genome if at least 70% of its nucleotide positions are contained in alignments that overlap it by 100 bp or more. For genes less than 100 bp, the size of the overlap must be 70% of the length of the gene or more. col 1- Species col 2- Number of E. coli genes `present' in that species col 3- Precentage of E. coli genes `present' in that species ===================== KPN 3120 71% SPA 3102 70% STM 3368 76% STY 3341 76% VCH 1864 42% YPE 2476 56% =====================