The LAD itself, of course, is probably the result of the complex interaction of many genes--not just one--and the malfunction of some single key gene simply short-circuits the system. For example, a faulty carburetor wire may prevent an engine from running, but the engine is more than a single carburetor wire. Many thousands of genes contribute to the makeup of the human brain--more than to any other single aspect of the human body. To isolate the specific set of genes that act as the blueprint for the language organ is something no one has even begun to do.