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Across 1. Non-twin tissues. 4. Impairment of kidney function. 5. Animal tissues. 6. Deficit of both B- and T-cells. 8. Antibodies from Streptococcus bacteria react against heart antigens. (2 Words) 9. Most common type of allergy response; mostly begins in seconds. (2 Words) 10. Immune system attacks so strongly, person's life is at risk. (2 Words) 11. Systematically destroys joints. 14. Twin tissues. 15. When a mass of lymphoid tissue becomes red, swollen, and sore. 16. Destroys myelin sheaths. (2 Words) 17. Impairs communication between nerves and skeletal muscles. (2 Words) 18. Thyroid gland produces more thyroxine than normal. (2 Words) 19. Systemic response of an allergic reaction. (2 Words)

Down 1. Abnormally vigorous immune responses that cause tissue damage. 2. Poison ivy, heavy metals, and certain cosmetic/deodorant chemicals. (3 Words) 3. Cripples immune system with the helper of T-cells 7. Causes deficient production of insulin. (2 Words) 12. Same-body tissues. 13. Mix of dead and dying neutrophils.