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 .
The basic difference between the conditions arises due to their underlying cause. Osteoarthritis is a degenerative disease. This means that it takes place because of wear and tear of the cartilage between the joints. Rheumatoid arthritis, on the other hand, takes place because of an autoimmune disorder.ummary: 1. Rheumatoid arthritis occurs due to an autoimmune response of the body, while osteoarthritis is mainly a result of mechanical wear and tear of the cartilage in between the joints. 2.