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 .
No one knows the exact cause or causes of autoimmune diseases (also called autoimmune disorders). However, doctors do know that you cannot catch these diseases from another person. Most research scientists believe that there is a link between autoimmune diseases, a person's genes, and factors in the environment.o one knows the exact cause or causes of autoimmune diseases (also called autoimmune disorders). However, doctors do know that you cannot catch these diseases from another person. Most research scientists believe that there is a link between autoimmune diseases, a person's genes, and factors in the environment.