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The new technique in a lab to fix genes that cause to diseases including sickle cell anemia. the breakthrough builds on an existing method to edit dna called chris burke. except researcher will say that it is a lot more precise. jonathan reporting with more on this. >> very exciting, it is called prime editing, and it may offer a more precise way of correcting dna than current methods. instead of cutting both strands of dna at the same time like a scissors, the prime editor nips one side and inserts an edited sequence. then the tool nips at the other side and the cell corrects itself with the ...

>> this is medical experimentation on human beings. if we alter the faulty genes, we don't know what we're doing, what the scientists are doing to the healthy jane and it's not just affecting that one individual child. you are changing their dna sequence, which means their children and their children's children will be affected by whatever changes you make in the laboratory. so it's an enormously problematic. everybody wants to eliminate the suffering of these genetic diseases, but there are all sorts of unintended consequences that come along with us because if you can change the dna in order...

He was out and about. >> less than six hours after henry said he saw williams and cater here, police heard a splash under this bridge. cater's body washed up downstream two days later. 30 years ago, there was no dna testing. now there is. and so new evidence. remember those two human hairs found inside 11-year-old patrick baltazar's shirt? in 2007, the hair fragments were sent to the fbi's dna laboratory in quantico, virginia. the result? the lab said it found this dna sequence in only 29 out of more than 1,100 samples of african-american hairs in its database. less than 3%. most important, wa...

>> he was out that night, no question in my mind. he was not at home. he was out and about. >> less than six hours after henry said he saw williams and cater here, police heard a splash under this bridge. cater's body washed up downstream two days later. 30 years ago, there was no dna testing. now there is. and so new evidence. remember those two human hairs found inside 11-year-old patrick baltazar's shirt? in 2007, the hair fragments were sent to the fbi's dna laboratory in quantico, virginia. the result? the lab said it found this dna sequence in only 29 out of more than 1,100 samples of af...

He was out and about. >> less than six hours after henry said he saw williams and cater here, police heard a splash under this bridge. cater's body washed up downstream two days later. 30 years ago, there was no dna testing. now there is. and so new evidence. remember those two human hairs found inside 11-year-old patrick baltazar's shirt? in 2007, the hair fragments were sent to the fbi's dna laboratory in quantico, virginia. the result? the lab said it found this dna sequence in only 29 out of more than 1,100 samples of african-american hairs in its database. less than 3%. most important, wa...