(or EPC) a term that has been applied to multiple different cell types that play roles in the regeneration of the endothelial lining of blood vessels.

Oligodendrocyte progenitor cells (OPCs), also known as oligodendrocyte precursor cells, NG2-glia, O2A cells, or polydendrocytes, are a subtype of glia in the central nervous system named for their essential role as precursors to oligodendrocytes and myelin.