Crossword Activity

12345
Across
  1. 1. general defense that causes pain, redness, and swelling
  2. 4. type of B cells responsible for long-term immunity
  3. 5. blood group that is a universal donor
Down
  1. 2. molecule on the surface of a pathogen that the immune system recognizes as a "foe"
  2. 3. T-lymphocytes mature in the ____