Is stem cell is beneficial to preserve. plz give brief description?

Stem cells: It is impossible to give you a brief answer on stem cells. I am attaching a link form the INH that is very inclusive and goes over all the basics of Stem cells. http://stemcells.nih.gov/info/basics/Pages/Default.aspx

Stem cell: It is beneficial if you are going to need it in the future for something like bone marrow transplant. The probability of that, of course is, very, very, very low. So, most people will probably NOT use it