A Treg cell has encountered its self antigen on an antigen-presenting cell. This Treg cell then inhibits neighboring T cells by producing

Which of the following events could prevent sensitization to an allergen during a first exposure?

Which of the following results best supports the hygiene hypothesis?

All routes of vaccination successfully elicit virtually identical immune responses

What is the difference between the heavy chain in B cells and the β (beta) chains in T cells?

Match the following mechanisms of action with the immunosuppressive drug 

Multiple mechanisms provide a series of checkpoints that function to maintain immunological self-tolerance. A breakdown in any one of these mechanisms is likely to lead to autoimmunity.  

Class II MHC molecules do not bind Class I peptides during assembly due to the prescence of:

An antigenic drift occurs every 10-15 years

Systemic lupus erythematosis (SLE) is an autoimmune disease characterized by the development of autoantibodies specific for DNA and other nuclear antigens. Patients with SLE show a wide variety of symptoms that include anemia, skin rashes, joint and muscle pain, heart problems, and kidney damage. This is considered a systemic autoimmune disease because: