Methylcellulose Based Media

My cousin is very excited that their team will be working on a new project.  As a cancer researcher it is her duty to study the different types of cancers and know the cause so she can find ways to prevent the cancer from occurring.  She mentioned about methylcellulose based media.  She tried to explain it to me but I didn't understand it very well.  All I know is that it has something to do with their study of stem cells.  These cells are believed to be the answer to most of our medical problems like cancers, heart disease and diabetes.