A synthetic peptide for use as a blocking control in assays to test for specificity of Abo antibody, Alternative Names: Abo control peptide, Abo antibody Blocking Peptide, Anti-Abo Blocking Peptide, ABO blood group, transferase A, alpha 1-3-N-acetylgalactosaminyltransferase, transferase B, alpha 1-3-galactosyltransferase Blocking Peptide, NAGAT Blocking Peptide