FIG. 4.

Phylogenetic relationships among family 19 chitinase genes of Actinobacteria. An unrooted phylogenetic tree was calculated based on an alignment of conserved regions of family 19 chitinase genes from Actinobacteria. Organisms in which family 19 chitinase genes were found in this study are enclosed in boxes, and the numbers in parentheses are the strain numbers shown in Table 1. The numbers at the nodes are percentages which indicate the levels of bootstrap support, based on a neighbor-joining analysis of 1,000 resampled data sets.