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>> there's viruses. there's hijacking your immune system. but currently the technology is not i think really good enough. we need to make ways that are much safer, that don't result in problems like your immune system going crazy -- >> shutting down? >> exactly. we don't want that. >> no. >> we're going to show you how we make the dna. all life comes from four chemicals. there's an a, c, there's a t, and there's a g. we take code sent us and we turn it into physical a, t, c, g strands that can be run inside of cells. >> synthetic dna is already being used experimentally in gene therapy to trea...

>> so if your partner has it and you were to have another child -- >> my kid could have it. >> yeah. >> how would i change that gene? >> we'll look at the hexasequence here and look at the particular mutation. here's the error. >> wow. >> literally that's the one letter that's wrong? >> yes. it's a screw-up. we're going to print out the correct copy. >> that's nuts. how would i get that into my body to fix that problem? >> there's viruses. there's hijacking your immune system. but currently the technology is not i think really good enough. we need to make ways that are much safer, that don't r...

Onset is about six months. >> wow. >> so if your partner has it and you were to have another child -- >> my kid could have it. >> yeah. >> how would i change that gene? >> we'll look at the hexasequence here and look at the particular mutation. here's the error. >> wow. >> literally that's the one letter that's wrong? >> yes. it's a screw-up. we're going to print out the correct copy. >> that's nuts. how would i get that into my body to fix that problem? >> there's viruses. there's hijacking your immune system. but currently the technology is not i think really good enough. we need to make way...

C, t, g strands that can be run inside of cells. >> synthetic dna is already being used to treat or prevent disease. but costs are extremely high. it can cost billion os correctly print human dna. >> if you want to turn on the laser. >> austin hines has figured out a way to do it on the cheap. >> fire the laser, ejecting it into a collection plate. >> so each shot of the laser -- >> is $100. >> the falling prices means printing man made dna could be available to anyone who wants it it. >> would you ever hack your own genes? >> i definitely would hack my own sperm. why do i have this or that? y...