The ABO system consists of A, B, AB, and O blood types. People with type A have antibodies in the blood against type B. People with type B have antibodies in the blood against type A. People with AB have no anti-A or anti-B antibodies.
Developmental dyslexia, or specific reading disability, is a disorder in which children with normal intelligence and sensory abilities show learning deficits for reading.
Dyslexia is a specific reading disability due to a defect in the brain's processing of graphic symbols. It is a learning disability that alters the way the brain processes written material. It is typically characterized by difficulties in word recognition, spelling and decoding.