If you've already heard about stem cells, then you probably know that they are now being thoroughly researched because they are believed to be the answer to our health problems. These cells are being cultured because they have the ability to develop into many different cells in the body and they also work to repair the damaged cells. But before they are transplanted in the body, they are first measured through CFC assay (colony-forming cell). The frequency and proliferative ability of these stem cells are measured first before they are given to subjects. Hopefully in a few more years, they can be given to humans too.