PROMO (from Universitat Politècnica de Catalunya) from is a virtual laboratory for the identification of putative transcription factor binding sites (TFBS) in DNA sequences from a species or groups of species of interest. TFBS defined in the TRANSFAC database are used to construct specific binding site weight matrices for TFBS prediction. The user can inspect the result of the search through a graphical interface and downloadable text files. PROMO is using version 8.3 of TRANSFAC. Registration not required.