★ CRISPR and Sickle-Cell Disease Quiz
How many participants were involved in the clinical trial of exa-cel?
A. 9
B. 19
C. 29
D. 39
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What is the role of the Cas9 enzyme in the exa-cel therapy?
A. To cut both strands of DNA
B. To guide the enzyme to the target stretch of DNA
C. To stitch the DNA strands back together
D. To disable the BCL11A gene
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