Tag:SBP is a 38 amino acid residue artificial streptavidin-binding peptide (MDEKTTGWRGGHVVEGLAGELEQLRARLEHHPQGQREP). It can be used as an affinity tag for one-step purification of a tagged protein of interest and/or any associated macromolecular complexes. It can also be used as an epitope tag for protein detection (PMID:11722181).