Bayesian phylogenetic analysis of the glycosyl hydolase family 18 (GH18) domain from arthropod chitinase genes sequences. The number of GH18 domains in the chitinase genes analysed ranges from 1 to 5. For those genes containing more than one GH18 domain, they are labelled from 5' to 3' with A, B, C, D or E. Clade Ib consists of members that, based on sequence analysis, do not have the ability to hydrolyse chitin. Additional gene copies that cannot hydrolyse chitin are indicated with an asterisks (*). All gene members known to participate in some immune function are indicated in bold text.
McTaggart et al. BMC Genomics 2009 10:175 doi:10.1186/1471-2164-10-175