Autoimmune Disease:- The immune system normally produces antibodies against g foreign proteins but not against the native proteins of body, that is, the immune system can distinguish between "self" and "non-self", However, in rare cases, individuals begin to produce antibodies against their own antigens. These antibodies are called autoantibodies and the diseases resulting from their presence are the autoimmune diseases. Among these diseases are paroxysmal cold haemoglobinuria, myasthenia gravis and systemic lupus erythematous.
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