Sites about the defense mechanism of the body which are dependent on the humoral aspects of immunity as compared to the cell-mediated aspects which secrete Cytokines. Sites may include the mechanisms of interaction of antibody with antigen, as well as the cascade sequence that this invokes, through the complement system.

Sites may describe the molecular structure of antibodies, their classification and problems associated with their synthesis, such as the glycosylation of recombinant proteins, to mimic mammalian species, but are produced in plant cell host, "Plantibodies".