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A protein that resides in the microbial wall of staphylococcus aureus and interferes with opsonization by binding to the Fc portion of immunoglobulin. The protein has a deleterious effect on the epithelial cells that line the respiratory tract, and plays a role in the induction of pneumonia. Protein A also initiates polymorphonuclear cell migration into airway passages via TNFR1 activation. Check for \'https://www.cancer.gov/about-cancer/treatment/clinical-trials/intervention/C17166\' active clinical trials using this agent. (\'http://ncit.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI%20Thesaurus&code=C17166\' NCI Thesaurus)
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