+B27 refers to a specific human [MHC](/wiki/MHC) class I [Antigen](/wiki/Antigen). Its presence signifies a strong genetic predisposition to certain autoimmune conditions, notably [Spondyloarthritis](/wiki/Spondyloarthritis).
+## See also
+- [Autoimmune Disease](/wiki/Autoimmune_Disease)
+- [Ankylosing Spondylitis](/wiki/Ankylosing_Spondylitis)
+- [Gene](/wiki/Gene)
... 1 more lines