The ________ are also called as cytotoxic T-cell.

Step-by-step solution

Cytotoxic T-cells are a type of T lymphocyte that directly kills infected or damaged cells, such as those infected by viruses or cancer cells. Due to their direct killing mechanism, they are also known as killer T cells. Suppressor T cells (regulatory T cells) suppress the immune response. Memory T cells remember specific antigens for a faster response upon re-exposure. Helper T cells assist other white blood cells in immunologic processes. Answer: killer T cells