This affinity purified antibody is directed against the 6X His epitope and is useful in determining its presence in over expressed proteins in various assays. The antibody recognizes the 6X His epitope tag (His-His-His-His-His-His) fused to either the amino- or carboxy- termini of targeted proteins in transfected or transformed cells. This product is prepared by labeling high quality monoclonal mouse anti-6X His IgG (H+L) with the green fluorescent dye CF488A. CF488A is a superior alternative to the traditional green fluorescent dye FITC (or fluorescein) owing to its exceptional brightness and photostability. CF488A has brightness and photostability comparable to Alexa Fluor? 488.