World hails UK vote on three-person embryos

Following a 3 February vote in the UK House of Commons, the world may once again look to Britain to lead in fertility treatments, 37 years after in vitro fertilization was pioneered in the country. The vote lifts a ban on gene-altering fertilization techniques known as mitochondrial replacement, or three-person IVF, in which mitochondria - the cell's energy-processing structures - from a donor's egg cell contribute to a couple's embryo.

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