Let’s suppose you are interested in a microRNA gene, which i…

Let’s suppose you are interested in a microRNA gene, which is expressed in cultured human skin cells.  All available data suggest that this microRNA gene regulates the expression of gene X in these cells.  To test this idea, you would inactivate this microRNA gene using (                                        ) to test if a loss of this microRNA gene causes changes in gene X expression using (                            ).