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, predicted Nuclear Location Signals, UniGene information, as well as links to literature reference.