In this organised society called the immune system, there are cells that take on prominent roles - none are really accepted as unique nor exquisite to a specific cell type, but broadly accepted main roles.

Immuno-oncology, researcher and clinician.

Direct attack and killing

- Effector T cells
- Natural killer cells
- Neutrophils

Regulation and suppression

- Regulatory T cells
- Macrophages
- Myeloid Derived Suppressor cells

Help and coordination

- Helper T cells
- B cells and Plasma cells
- Dendritic cells

There are numerous specializations within each cell type. Genetic programs can be visualised as sort of like skill-trees enabling proficiency for certain tasks. At times, labeling cells based on their function becomes a rather subjective exercise.