
Keywords: BrdU، 5-bromodeoxyuridine; PWMD, periventricular white matter damage; HUC-MSCs, human umbilical cord mesenchymal stem cells; BrdU, 5-bromodeoxyuridine; HI, hypoxic–ischemic; BBB, blood–brain-barrier; PWM, periventricular white matter; VLBW, very low birth weight; PVL, periventricul