Yes, it is possible to extract tissue-specific stem cells post mortem.
The stem of a plant is full of undifferentiated cells. Thus the name stem cells.
Most likely because they are the cells from which all specialised cells Stem, i.e. stem cells are the precursors which form more differentiated types of cells, e.g. blood, bone are formed from, or...
'Cause maryam luvs lil wayne
differentiation