The Database of Arabidopsis Transcription Factors (DATF) collects all Arabidopsis transcription factors (totally 1922 Loci; 2290 Gene Models) and classifies them into 64 families.The Version 2 of DATF was updated at July 2006. It is based on the Arabidopsis Sequence of TAIR version 6 (20051108). It uses not only locus (gene), but also gene model (transcript, protein) and the detail information is for each gene model not for locus. It add multiple alignment of the DNA-binding domain of each family, Neighbor-Joining phylogenectic tree of each family, the GO annotation, homolog with the Database of Rice Transcription Factors(DRTF) . It also keeps old information items such as the uniq cloned and sequenced information of about 1200 transcription factors, protein domains, 3Dstructure information with BLAST hits against PDB , predicted Nuclear Location Signals, UniGene information, as well as links to literature reference.