Armored Personal Carrier. I think the APC is located where you find the Warden Crossbow.
Autoimmune diseases arise from an overactive immune response of the body against substances and tissues normally present in the body. In other words, the body actually attacks its own cells. An immune disorder is when the body cannot defend itself. [ Source: http://www.chacha ....n immune disorder is when the body cannot defend itself. [ Source: http://www.chacha.com/question/what-is-the-difference-between-immune-disorders-and-autoimmune-diseases ]. More Answers to  What is the difference between immune disorders and autoimmune diseases .
Graves' disease is an autoimmune disorder, and the most common one of its kind in the US. An autoimmune disorder is the body's immune system mistakenly identifying healthy cells as foreign invaders and attacking them. Graves' disease is the most common cause of hyperthyroidism. 2  The disease is also the most common type autoimmune disease in the US. 2. 3  It is more common in women under the age of 40, but can also be found in men. 4  Graves' disease affects an estimated 2-3% of the world's population.