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 .
An autoimmune disease is caused by the immune system attacking you instead of threats and diseases coming from outside you. In autoimmune diseases, the body makes a mistake an â¦ d attacks its own tissues. a condition that causes the body's own immune system to wrongly identify cells as foreign and attack them.