Scientist have produced genetically modified goats to produce large quantities of a spider silk, one of the strongest substances known to man. The transplanted gene allows the goat to produce milk containing an extra protein, which is then extracted and spun into spider silk thread.
Spider silk fiber could have several medical uses, such as for making artificial ligaments and tendons, for eye sutures, and for jaw repair. The silk could also have applications in bulletproof vests and improved car airbags.
Other than their ability to produce the spider silk protein, the goats do not seem to have any other differences in health, appearance, or behavior compared to goats without the gene.