Intensity scatter plot of proteome results. Label-free intensities of secretome proteins (mean of four biological replicates) of the ΔchiW (JJH08p) strain versus the secretome of the Db10 parental strain. Highly abundant proteins that were reduced significantly (P < 0.01) in the ΔchiW secretome are labeled red with the locations of the other, lower abundance, proteins shown in green (see Table 1). The three chitinases, ChiA, ChiB, and ChiC, as well as the chitin-binding protein, Cbp21, are the by far the most abundant of the proteins affected by the ΔchiW mutation.