Across
- 4. repeated exposure to pathogens stimulates ___ cells
- 5. lymphocytes that require antigen presentation
- 6. CD4+ cells are activated to become ____ cells
- 7. proteins secreted by B cells
Down
- 1. lymphocytes that make antibodies
- 2. CD8+ cells are activated to become ____ cells
- 3. molecules on almost all cells that display antigens
- 7. MP, dendritic cells & B cells are ___