An antibody to Protein A is an immunoglobulin that binds to Protein A molecules in the human body. Protein A is also a widely present in biological glycoprotein, which has a highly conserved structure and function, and can bind to a variety of immunoglobulins, including IgG, IgM, IgA, and so on.

Protein A antibodies are widely used in biomedicine. For example, it can be used in immunohistochemical staining, flow cytometry, proteomics research and other fields. In addition, Protein A antibodies can also be used to produce antibody-coupled drugs (ADCs), which enable targeted therapy of tumor cells by binding antibodies to drug molecules.