Re:A constant loud clicking or crunching noise in her head s...
by riahi on Sunday August 19, 2018 @07:58PM
(#17796897)
The Human Leukocyte Antigen complex is a protein complex that immune cells use to determine self from non-self cells. There are many many many possible alleles, some of which are thought to be defective and contribute to auto-immune disorders. The most notorious (for medical students studying for standardized tests) is HLA-B27.
https://en.wikipedia.org/wiki/HLA-B27
Specifically, check out the section on disease associations.
And
https://en.wikipedia.org/wiki/Human_leukocyte_antigen