Catalog › SS-31 Image 1 of 1 SS-31 $0.00 SS-31 is a synthetic Szeto-Schiller peptide with the sequence D-Arg-dimethylTyr-Lys-Phe-NH₂. Add To Cart Added! SS-31 is a synthetic Szeto-Schiller peptide with the sequence D-Arg-dimethylTyr-Lys-Phe-NH₂.