Positive selection in the thymus occurs when:
A. selectins, addressions or integrins bind to appropriate receptors and remain in the thymus
B. T cells that recognize an antigen present in the thymus are stimulated to divide
C. T cells that see MHC with an intermediate affinity are selected to survive
D. T cells that see self antigen are killed by apoptosis
Answer:C
Positive selection in the thymus occurs when:
A. selectins, addressions or integrins bind to appropriate receptors and remain in the thymus B. T cells that recognize an antigen present in the thymus are stimulated to divide C. T cells that see MHC with an intermediate affinity are selected to survive D. T cells that see self antigen are killed by apoptosis