STAT+: Next-gen CRISPR tools improve editing accuracy in embryos, but also stoke ethical concerns

LONDON — The use of an advanced genome-editing tool in early embryos pulled back the curtain on the role of one of the key genes that orchestrates the first stages of human development, scientists reported Thursday, a research endeavor that both focuses on a basic biological question and heightens the debate about whether such a tool could or should ever be used to make a baby.  The new research, published in the journal Nature, underscored that next-generation genome-editing tools are more prec...