Biology

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Put the following procedures of gene therapy in order:

a. The healthy gene is delivered to a cell in an inactivated virus.

b. Researchers determine which gene is mutated and causes the disease.

c. The functioning protein is used in the cell.

d. The cell starts copying the healthy gene.

Here's what I got:

1. B
2. A
3. ?
4. ?

Please help thank you.

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