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 .
A. Autoimmune diseases usually do not usually have a simple, single cause. There are usually two major factors that are involved in causing them: genetics and environment. Genetics-Even with a genetic connection to autoimmune disease, there is no guarantee that you will develop an autoimmune disease.Something must turn on your immune system to trigger an autoimmune response. Environment-Environmental factors make up more than half the risk of developing an autoimmune disease.enetics-Even with a genetic connection to autoimmune disease, there is no guarantee that you will develop an autoimmune disease. Something must turn on your immune system to trigger an autoimmune response. Environment-Environmental factors make up more than half the risk of developing an autoimmune disease.