crosses the placenta and provides passive immunity to the fetus., IgG, promotes pathogen lysis, opsonization, and inflammation., Complement system, breaks down peptidoglycan in bacterial cell walls., Lysozyme, protects mucosal surfaces and is found in saliva, tears, and breast milk., Ig A, inhibit viral replication and activate antiviral defenses., Interferons, usually forms a pentamer and is the first antibody produced in a primary immune response., IgM, an acute-phase protein that binds to certain microbial components and promotes opsonization., C-reactive protein (CRP), participates in allergic reactions and defense against helminths., IgE, antimicrobial peptides that damage microbial membranes., Defensins, functions mainly as an antigen receptor on naïve B lymphocytes., IgD, regulate communication, activation, proliferation, and differentiation of immune cells., Interleukins, recognizes microbial carbohydrates and activates the lectin complement pathway., Mannose-binding lectin, can activate the classical complement pathway., IgG and IgM, stabilizes the alternative complement pathway C3 convertase., Properdin, commonly exists as a dimer in secretions and contains a J chain and secretory component., IgA

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