Residents of the District of Columbia lack full democratic representation in the U. S. Senate or the U.S. House of Representatives. Representation in Congress is limited to a non-voting delegate to the House of Representatives and a shadow Senator.
Huntington's disease. Definition. Huntington's disease is an inherited disease that causes the progressive breakdown (degeneration) of nerve cells in the brain. Huntington's disease has a broad impact on a person's functional abilities and usually results in movement, thinking (cognitive) and psychiatric disorders.
Huntington's disease is commonly thought to be a hereditary neurodegenerative disease caused by the misfolding of certain proteins, which lose their normal structure and cannot be disposed of by the body. The mutant proteins then accumulate in the brain, where they eventually become toxic to nerve cells.