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Transcription factors are modular in nature in all organisms. In general, they have a DNA binding domain, one or more transcription activation and/or repressor domain, and often a dimerization domain. In many cases, transcription factors also have other protein-protein interaction domain(s). The three largest families of transcription factors in Arabidopsis, AP2/EREBP (APETALA2/ethylene responsive element binding protein), MYB-(R1)R2R3, and bHLH (basic helix-loop-helix), each represent only ∼9% of the total, and there are several other families with comparable numbers of genes.<br /><br />SBP (for SQUAMOSA-pROMOTER BINDING PROTEIN) domain is a sequence specific DNA-binding domain found in plant proteins.