. >> dan perlman, i'm a scientist, i've been following a crispr story. i'd like you to imagine we live in an age with no ice cream and you invent ice cream. and your friends come over and you say, how do you like it they say, we love it. and then you say, well it causes cholesterol elevation and it may be dangerous and it has some hazardous side effects maybe we shouldn't do anything about this. well, maybe we should publish it on the internet. i think crispr is like that. the cat is out of the hat and capitalism is here to stay and i don't understand in what walter alluded to, the free for all, how we'll have any control over it if patent offices are going to be irrelevant, etc., what's your scenario for the future, say over five to 10 years? dr. doudna: you bring up a good point. one of the things thatst so, on one hand wonderful, but also very challenging, about the technology is that it's widely available. whether -- patent offices notwithstanding, anybody doing academic or commercial research right now can get ahold of the crispr molecules and tools