There are 25 million to a billion different T-cells in your body. Each cell has a unique T-cell receptor that can fit with only one kind of antigen, like a lock that can fit with only one shape of key. Antigens and receptors work a lot like a lock and key. Each of the 25 million to a billion different T-cells fit with a different shape of antigen.
Motivating operation. Motivating operation (MO) is a behavioristic concept introduced by Jack Michael in 1982. It is used to explain variations in the effects in the consequences of behavior. Most importantly, a MO affects how strongly the person is reinforced or punished by the consequences of their behavior.
âstudents perform in hospitals, thereby gaining a deeper awareness of the therapeutic power of musicâ More example sentences âHe took swift and firm action, thereby saving the life of the future president of the Chinese Republic.â âMost cyclists are considerate and thereby enhance their own safety and that of others on the road.â âI think this was a deliberate ploy to muffle the sound of my clock radio, thereby ensuring my lateness.â