Virus-infected cells secrete proteins called

The thymus and bone marrow are.....

What are $P$ and $Q$ in the given structure?

Lymph nodes are secondary lymphoid organs. Explain the role of lymph nodes in our immune response.

In higher vertebrates, the immune system can distinguish between self and non-self cells. Due to genetic or other unknown reasons, the immune system sometimes loses this property and starts attacking self-cells, resulting in:

Which of the following is related to humoral immunity?