What are the two corollaries related to the immune system?

(N/A) The two corollaries of the immune system's ability to differentiate between self and non-self are:
$1$. Higher vertebrates can distinguish between foreign molecules as well as foreign organisms. Most of experimental immunology is based on this aspect.
$2$. Sometimes,due to genetic or other unknown reasons,the body attacks its own cells. This results in damage to the body and is known as an autoimmune disease. An example of this is rheumatoid arthritis.