The regulation of cellular processes occurs at many levels. Gene expression, where the DNA is transcribed into an RNA molecule, is exquisitely controlled but so are the many downstream actions as well. For instance, the new RNA molecule can be inactivated by an incredible process referred to as RNA interference. This sophisticated process targets specific genes, and as usual nature’s own tools provide researchers with excellent means to investigate and harness biology. For instance, researchers have used RNA interference to turn off one gene at a time in the human cell to determine its function. Read more