Phylogenetic analysis of vertebrate CDK9, cyclin T2 and cyclin K. Phylogenetic trees and tables of amino acid sequence identity are shown for (A) CDK9, (B) cyclin T2 and (C) cyclin K. Accession numbers used to generate this data are: human CDK9, NP_001252; human cyclin T2, NP_001232; human cyclin K, AAF82290; mouse CDK9, BAC40824; mouse cyclin T2, XP_129395; mouse cyclin K, AAH27297; zebrafish CDK9, AAP47016; zebrafish cyclin T2, AAH44378; zebrafish cyclin K, XP_697908.