Like as far as i know. They can be designed so they make certain proteins. So this allows goats to create proteins that are needed for insulin or the proteins for bulletproof vests. But say they are making proteins that are used in the body like insulin does this affect the goat's system at all? or does the protein simply stock pile up and go unused? would it also be possible to essentially make toxins(venom from spiders/snakes, etc) useing this same method? and couldnt you also make it so the goats design narcotics essentially? Like morphine for example.