Immune cells

3. The most abundant granulocytes and first responders to bacterial infection
4. Innate lymphocytes that kill virus‑infected or tumor cells
5. Adaptive lymphocytes that recognize antigen via T‑cell receptor and kill infected cells
7. Tissue‑resident cells that degranulate histamine in allergic reactions
10. – Phagocytic tissue cells that engulf pathogens and debris
12. Innate lymphoid cells lacking antigen receptors but producing key cytokines

1. Adaptive lymphocytes that mature into antibody‑secreting plasma cells
2. Cells expressing both NK and T‑cell markers, bridging innate and adaptive immunity
6. Granulocytes involved in parasitic infections and allergic responses
8. Regulatory T cells that suppress immune responses to maintain tolerance
9. Antigen‑presenting “tree‑like” cells that activate T cells
11. Circulating phagocytes that differentiate into macrophages in tissues