One technique of gene therapy that is currently being investigated and developed is to
A. use genetically altered virus cells to "infect" disordered cells with healthy genes.
B. use a long, thin needle to insert healthy genes into the amniotic sac during the woman's pregnancy.
C. use gene transplants after the infant is born to replace the problematic genes.
D. treat the mother with megadoses of vitamins during her pregnancy.
Answer: A
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