4 「Each has receptor molecules on its surface that Bind to a specific antigen. The two primary types, B cells and T cells, originate from stem cells in Bone marrow and travel to lymphoid tissues. 」
4 「Antibodies produced by plasma cells Bind to antigen-Bearing cells, marking them for destruction. Acquired immunity relies on the long-term survival of sensitized T and B memory cells, which can proliferate quickly upon reinfection by the same pathogen.」
3 「Any ligand that can Bind to the metal at two or more points to form a ring structure, more stable than a nonchelated compound of the same general chemical formula, is a chelating agent. The process of Binding to the metal is called chelation.」