Anti-DYKDDDDK Affinity Gel is optimally suited for immunoprecipitation and purification of FLAG® tagged fusion proteins. Anti-DYKDDDDK Affinity Gel antibody recognizes the FLAG® epitope tag fused to either the amino- or carboxy- terminal ends or an internal location of targeted fusion proteins. The epitope tag peptide sequence was first derived from the 11-amino-acid leader peptide of the gene-10 product from bacteriophage T7. DYKDDDDK is the most commonly used hydrophilic octapeptide tag. Use D-Y-K-D-D-D-D-K peptide for competitive elution to recover fusion protein (see protocol). Anti-FLAG® is a registered trademark of Sigma-Aldrich. Refer to the Protocol for complete instructions for use including preferred buffers for elution. Do not use buffers that may denature the anti-DYKDDDDK antibody.