In the short statement that began the chapter, the innate immune system was likened to ordinary police and the adaptive immune system was likened to specialized backups, such as snipers. For those of...

In the short statement that began the chapter, the innate immune system was likened to ordinary police and the adaptive immune system was likened to specialized backups, such as snipers. For those of you who follow true crime or mystery stories, you might find it amusing—and helpful in your studies—to try to come up with other criminal justice analogies. For example, you might make an analogy between ‘‘antibody production by B cells’’ and ‘‘smart bombs, surveillance, and tracking devices.’’ See what you can do with Th cells, cytokines, APCs, and NK cells.