This is a weak form of in-silico search, in which the consensus sequence for the motif is compared to genomic positions and the number of mismatches (between candidate site and consensus) is used as a measure of site-quality.

A Western blot (also frequently called immunoblot) is a gel-based technique used to determine the presence of specific proteins in a sample by means of separation (through gel electrophoresis) and detection (using a protein-specific antibody). Less frequent than the equivalent RNA Northern blot, it is typically used in TF-binding site analysis to validate differential regulation of target genes.