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news. there s new hope tonight for thousands of families who live with the prospect of passing on inherited diseases to future generations. for the first time, scientists have successfully repaired a faulty gene in human embryos. they used a process known as gene editing to correct dna that causes a deadly heart condition. but critics are warning that the technique could, ultimately, be used to create so called designer babies . our medical correspondent fergus walsh reports. the goal could not be more ambitious: to eradicate inherited diseases. these scientists have taken an impressive first step on a long road, editing dna in human embryos. so how is it done? inside the nucleus of each of ourselves is our genome, billions of pieces of dna. it s the instruction manual for life. the scientists were targeting a faulty gene that causes a serious heart condition. they fertilised a healthy egg with sperm from a man carrying the faulty gene. they then injected the gene ed ....