RNA interference is a mechanism of gene regulation in eukaryotes. Arrange the steps by which RNAi carries out gene regulation in the correct order.

1. The siRNA binds to a special protein,

which degrades one strand.

2. One strand of siRNA associates with the

protein to form an RNase complex.

3. The enzyme dicer cleaves dsRNA to form

small interfering RNA (siRNA).

4. The RNase complex binds to a specific

mRNA and degrades it.