Phylogeny of the annotated insect (fly, mosquito and honeybee) Dscam exon 4 homologs and organization of tandem arrays. (A) Only branches with a posterior probability greater than 0.5 are shown (probabilities are shown beside each branch). Roman numerals (I thru V) and colored branches denote the five major subclades of the Clade I (Figure 3) sequences. Each major subclade contains at least one sequence from each fly, mosquito and honeybee. 5B. (B) Comparison between tandem arrays of honeybee (top), fly (middle) and mosquito (bottom) annotated Dscam exon 4 variants. Colored boxes represent the exon variants and the numbers below indicate the position of the variant within the tandem array. The box colors correspond to the colors of the text labels (rather than branch colors) shown in Figure 5A.