Frequency of GI, GII, and GIII 16-mers in the extragenic space of the SBW25 genome.

aIn order to identify closely related members of each GI, GII and GIII sequence family extragenic space was searched for all possible sequences that differed by up to four substitutions. The number in brackets is the number of variant sequences: e.g., with no substitutions there are just the three sequences (Table 1); allowing one substitution there are 147 different sequences, and so forth. The number found in extragenic space was compared to a null (random) model based on randomly assembled extragenic space (see text).bData are means and standard deviation from 100 independent extragenic space randomizations.