The DYKDDDDK peptide (Asp-Tyr-Lys-Asp-Asp-Asp-Asp-Lys) is intended for immunoaffinity chromatography to allow elution under non-denaturing conditions by competitive elution with excess of free DYKDDDDK Peptide. Synonyms: synthetic DYKDDDDK peptide, ddddk peptide, dykddddk peptide, Asp-Tyr-Lys-Asp-Asp-Asp-Asp-Lys, control peptide