In 2015, a group of Chinese researchers used CRISPR-cas gene editing to edit the HBB gene in 86 human embryos. What were the conclusions form this study?
A) CRISPR-cas was not ready for use in human patients.
B) CRISPR-cas gene editing had no negative effects on the surviving embryos.
C) CRISPR-cas is safe for use in human patients.
D) 71 of the 86 embryos contained the desired gene edit.
Answer: A
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