Stem Cells al Giorgio

I had a thought today: is whatever analogous to stem cells?  Is whatever being, for example, being that has not yet been determined to be either common or proper, contingent or necessary…is it being that is capable of being either, or both?  Limbo seems to work this way.  It is a state before life, before we set off down the road to either salvation or perdition, just as stem cells have not yet set off down the road to being blood cells or muscle cells or (awesomest of all) neural cells…