21. The Immune System

Toll-like receptors are found on __________.

What is the difference between an epitope and an antigen?

__________ is the property of lymphocytes that prevents them from attacking the body's own cells.

Self-reactive B cells are eliminated in the __________.

A nonself substance that can provoke an immune response is called a(n) __________.

Lymphocytes that develop immunocompetence in the thymus are __________.

MHC II proteins are found on __________.

Which of the following types of cells is involved in adaptive immunity?