IMMUNOLOGY

Detailed explanation-1: -A type of immune cell that can kill certain cells, including foreign cells, cancer cells, and cells infected with a virus. Cytotoxic T cells can be separated from other blood cells, grown in the laboratory, and then given to a patient to kill cancer cells.

Detailed explanation-2: -Natural killer T cells are a type of T cell that also have certain features of natural killer (NK) cells. They can kill invading microorganisms, such as bacteria and viruses, by releasing cytokines. They can also kill certain cells, such as cancer cells, either directly or by causing other immune cells to kill them.

Detailed explanation-3: -Cytotoxic T-cells kill cells infected with viruses and bacteria, and they also destroy tumor cells. Helper T-cells: Helper T-cells are also called CD4+ cells because they have a CD4 receptor on their membranes. Unlike cytotoxic T-cells, helper T-cells don’t kill cells directly.

Detailed explanation-4: -T cells are a part of the immune system that focuses on specific foreign particles. Rather than generically attack any antigens, T cells circulate until they encounter their specific antigen. As such, T cells play a critical part in immunity to foreign substances.