immune system

6. the changes that occur within a cell as it undergoes programmed cell death
7. the antigen receptor on B cells
8. the process by which an MHC molecule binds to a fragment of an intracelluar protein atigen and carries it to the cell surface
11. a protein secreted by plasma cells that binds to a particular antigen and marks it for elimination
12. long-lasting immunity conferred by the action of a person's B cells and T cells
14. the kind of defense that is mediated by B lymphocytes and T lymphocytes
15. a surface protein that binds to class I MHC molecules on target cells
16. a surface protein that binds to class II MHC molecules on antigen-presenting cells
17. molecules that are restricted
18. genetically determined classes of human blood
19. a cell that ingests bacteria and viruses and destroys them

1. the general term for a surface protein
2. an immunological disorder in which the immune system turns against self
3. a macromolecule that elicits an immune response by lymphocytes
4. the branch of acquired immmunity that involves the activation of cytotoxic T cells
5. found on nearly all nucleated cells
9. an acute, whole-body, life-threating, allergic response
10. the name of the late stages of HIV infection
13. a type of lymphocyte that develops to maturity in the bone marrow