Related Clues:
- Same element turned up in some protein
- Soldier perhaps, one lad guarding daughter for personal protection
- Fighter in blood
- Lymphocyte aiding immune response
- Type of lymphocyte
- Immune-system element
- Substance in biology or botany I'd mistaken
- Protein produced in the blood
- Another term for T-lymphocyte
- It's counteractive and, boy, it's volatile
- Stupidly obtain extremely dodgy protection against disease
- Immune system protein
- Immune response participant
- Immune system element
- Independent group following worker's protection against infection