And therefore the wide blood cells will begin to attack these otherwise normal cells. So a genetic predisposition is believed to be one possible cause of autoimmunity. Research indicates that autoimmunity runs in the family or may run in the family and may be passed down to offspring from parent. Now, genetic mutations, for example in the DNA that codes for MHC membrane proteins may lead to autoimmunity as we just discussed. Now let's move on to factor number two that might lead to autoimmunity infections by pathogen. So let's suppose some type of pathogen infects our body and infects a cell.