Description: The E11 monoclonal antibody reacts with human and non-human primate CD35, which is also known as complement receptor 1 (CR1). CD35 is expressed on B cells, T cell subsets, follicular dendritic cells, macrophages, neutrophils, eosinophils, and erythrocytes. This cell surface protein is also present on non-immune cells such as glomerular podocytes and Langerhans cells. CD35 binds the complement components C3b and C4b, which are derived from cleavage of C3 and C4, respectively, in the classical and alternative complement pathways. In humans, CD35 has been implicated in a variety of roles, including complement activation, transporting C3 complexes on erythrocytes, phagocytosis of complement-bound neutrophils and macrophages, B cell proliferation, and opsonization.