Angiogenesis
placenta-derived mesenchymal stem cells (P-MSC).
We evaluated arterial angiography data 6 months after cell injection and classified the degree of collateral vessel development as + 0 (no collateral circulation), + 1 (slight collateral circulation), + 2 (moderate collateral circulation), and + 3 (high collateral circulation) [Changes in collateral artery development on angiography 6 months following implantation of placenta-derived mesenchymal stem cells (P-MSC). 