– Yellow Fluorescent Protein (YFP) is a mutant of Green Fluorescent Protein (GFP), whose fluorescence wavelength is shifted to a longer yellow spectrum due to a change in amino acid 203 from threonine to tyrosine. As a tag, fluorescent proteins allow fusion proteins to autofluoresce and determine the localisation of target genes in cells without the use of antibodies or probes and with less interference. Targetmol’s YFP Tag Agarose efficiently enrich and purify YFP and its fusion proteins, and also bind GFP and EGFP tagged proteins, but not BFP and RFP tagged proteins.