Immune tolerance the resulting effect is similar. Immune tolerance is important for normal physiology. Central tolerance is the main way the immune system learns to discriminate self from non-self. Peripheral tolerance is key to preventing over-reactivity of the immune system to various environmental entities (allergens, gut microbes, etc.). Deficits in central or peripheral tolerance also cause autoimmune disease, resulting in syndromes such as systemic lupus erythematosus, rheumatoid arthritis, type 1 diabetes, autoimmune polyendocrine syndrome type 1 (APS-1), and immunodysregulation polyendocrinopathy enteropathy X-linked syndrome (IPEX), and potentially contribute to asthma, allergy, and inflammatory bowel disease. And immune tolerance in pregnancy is what allows
Wolf attack animal may break off the attack or be convinced to look elsewhere for its next meal. In contrast, during "determined" predatory attacks, the victims may be repeatedly bitten on the head and face and dragged off and consumed, sometimes as far away as 1-2.5 km from the attack site, unless the wolf or wolves are driven off. Experts in India use the term "child lifting" to describe predatory attacks in which the animal silently enters a hut while everyone is sleeping, picks up a child, often with a silencing bite to the mouth and nose, and carries a child off