Decision tree describing the classification of Plant, Animal, and Fungal bHLH sequences by amino acid sites found in the bHLH domain. Each box of the figure represents a step in the decision tree which consist of a number of bHLH sequences from each Kingdom, and the amino acids at a given bHLH position (state). The sample size and proportion of group representatives is provided in the accompanying table. Diamonds contain the bHLH amino acid site which bifurcate the data into subsets of the previous state. Analysis is similar to a dichotomous taxonomic key.
Sailsbery and Dean BMC Evolutionary Biology 2012 12:154 doi:10.1186/1471-2148-12-154