Kinases of Homo sapiens are grouped into a hierarchical classification of three levels: group, family, and subfamily. You can browse the genes through the levels in the figure below. Each node is a group, family, subfamily or gene. The size of node is corresponding to gene number within a class (also shown in the parentheses). The families, subfamilies and genes are collapsed for simplicity, and you can view them by clicking the nodes. You can also find a complete gene list of a class, or the detail information of a gene by clicking the node name.