An international team of medical researchers has discovered a connective tissue(結合組織)disease that is a molecular cousin of Marfan's syndrome, but even deadlier. Loeys-Dietz Syndrome is similar to Marfan's in that it is caused by a genetic flaw(欠陥)that weakens tissue, preventing it from holding together properly. The result is a major threat to the integrity of the aorta(大動脈)in Marfan's syndrome and many blood vessels in Loeys-Dietz syndrome.