Which of the following is the first signal for the activation of T cells?

What is the primary function of CD4+ T cells once they are fully activated?

In the context of immune response, which of the following best describes the role of macrophages in activating T cells?

Which type of immune response is primarily responsible for the rejection of bone marrow transplants?

Identify the key molecule that facilitates the destruction of infected cells through the action of natural killer cells (NK).