Antibodies, compositions for use in detecting or capturing a polypeptide in a sample, and methods for detecting or capturing a polypeptide in a sample

An antibody that specifically binds to a first modified IgG heavy chain constant region which has originated from human IgG heavy chain constant region, wherein the first modified IgG heavy chain constant region lacks both of glycine at position 446 according to the EU numbering system and lysine at position 447 according to the EU numbering system, wherein an amino acid at position 445 according to the EU numbering system remains in the first modified IgG heavy chain constant region.