USMLE Step 1

USMLE Step 1 Question of the Day!

There is a minor alteration of MHC-I antigens when a cell is invaded by a virus. The immune system will not recognize the infected cell without the help of alpha and beta interferon inducing increased class I antigen expression on the cell’s surface. Which of the following is the source of interferon-beta?

A) fibroblasts
B) T cells
C) B Cells
D) Macrophages
E) Natural killer cells


















Check back tomorrow for your answer.