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, also called developmental reading disorder, is one of the most common types of language disorders. This disorder describes an inability to process graphic symbols, such as those in written language. The problem is not related to vision, but rather the processing and understanding of what is being seen.