Staphylococcal Protein A

**Definition:** A protein present in the cell wall of most Staphylococcus aureus strains. The protein selectively binds to the Fc region of human normal and myeloma-derived IMMUNOGLOBULIN G. It elicits antibody activity and may cause hypersensitivity reactions due to histamine release; has also been used as cell surface antigen marker and in the clinical assessment of B lymphocyte function.

**Tree numbers:** - D12.776.097.025.821 - D12.776.097.820 - D23.050.161.821

**Synonyms:** - Protein A