Variability of genes associated with different functional categories. Blue bars correspond to genes which were present at higher copy number (Log Ratio >1) in at least one of the A. salmonicida isolates that in A449. Red bars correspond to genes which were divergent or missing (Log Ratio <-1) in at least one of the A. salmonicida isolates. Upper panel: Number of variable genes assigned to each functional category. Lower panel: Percent of genes in each functional category which were variable.