stem cell
noun /ˈstem sel/
  /ˈstem sel/
 - a basic type of cell which can divide and develop into cells with particular functions. All the different kinds of cells in the human body develop from stem cells.- Stem cells are the key to the body’s ability to renew itself.
- Tests suggest that stem cells could be used to regenerate damaged body parts.
- Stem cell research is the essential first step for cloning.
 Oxford Collocations DictionaryStem cell is used before these nouns:- transplant