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(A) In germline gene therapy, genetic changes are made to reproductive cells.
(B) In this way, the genome of the recipient is changed, but this change is not passed onto the next generation.
(C) Scientists do not know all the functions of our genes and only know some of the genes involved in genetic diseases.
(D) Understandably, people have fears about this powerful technology and are worried that we may use it in ways to change our humanity.