This sequence is the hallmark of MUC1 mucin. MUC1 is a highly glycosylated type I transmembrane glycoprotein with a unique extracellular domain consisting of a variable number of tandem repeats (VNTR) of this 20 amino acid peptide It is overexpressed on the cell surface of many human adenocarcinomas and hematological malignancies, including multiple myeloma and B-cell lymphoma, making MUC1 broadly applicable target for immunotherapeutic strategies.