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You see, protein is built in a chainlike fashion, with amino acids as the links. So, if your DNA specifies that a protein should be made using the amino acid valine, then lysine, and finally serine, then those amino acids would be assembled in that sequence.

3X FLAG Peptide is a synthetic polypeptide containing three repeated DYKXXD amino acid sequences, often used to competitively bind Anti-Flag antibodies.3XFlag Peptide is mainly used for protein identification and purification, such as elution of Flag fusion expression proteins bound to Anti-Flag antibodies during immunoprecipitation[1-5].

Flag peptide is the peptide sequence of amino acids, which is hydrophilic and has high immunogenicity.