Dendrograms based on the sequence similarity of various domains found in cytoplasmic tyrosine kinases. Members of different groups of tyrosine kinases are indicated in different colors. The consensus domain organization of kinases of the specific subfamily is indicated at the nodes of corresponding subfamilies. (a) Catalytic kinase domain; (b) SH2 domain; (c) SH3 domain. The bootstrap values obtained for 1,000 replicates are shown.