MBL2 and viral infectious disease: Acute-phase proteins produced by the liver and other cells responding to viral infections have been shown to include α1-AT, SAP (serum amyloid P component), PTX3, SAA (serum amyloid A), PTX1 (C-reactive protein), MBL (mannose-binding lectin), and others out of the approximately 200 acute-phase proteins produced in the body [43].