MKI67 and periventricular leukomalacia: The number of Ki-67-positive hepatocytes per visual field in the regenerating liver lobe was greater in the PVL+ISS group than in the PVL group at 48 h (380.83±67.65 versus 224.10±88.60, p<0.01) and 72 h (179.77±48.08 versus 119.93±27.58, p<0.05).