1.   The mechanism by which foreign antigens are presented to T lymphocytes is central to the whole of immunology.

2.   This pattern of expression reflects their role in foreign antigen processing and recognition by T cells.

3.   None of us attack the food we eat, rife with foreign antigens as it is.

4.   That attack often involves creating a molecule called an antibody designed specifically to fit the unique shape of the foreign antigen.

5.   Unanue then showed that the foreign antigens are peptides.