The most frequent oligonucleotides (9- and 10mers) containing all four nucleotides in the CDS of N.meningitidis Z2491, N.meningitidis MC58, N.gonorrhoeae FA1090, H.influenzae KW20, P.multocida PM70 and E.coli K12 were counted; E.coli K12 is included to illustrate the distribution in a negative control. DUS denotes either the neisserial 10 bp DUS or the H.influenzae 9 bp DUS. The length of the bars represent the number of DUS found in CDS. The bar is split into the expected number (red) and the abundance (blue), which is the actual number found minus the expected number. DUS and DUS-overlapping sequences (see Fig. 1) were counted separately and illustrated as the shaded areas; the solid areas illustrate oligonucleotide counts if DUS were masked before counting.