FLT1 and ischemia: Next (Figure 4), we utilized the C5.0 decision tree to display the criteria for splitting used in the inter-group classification: 1) if Flt1 expression is ≤ 23.029 and Gpx3 expression is ≤ 20.448, the cardiac graft belongs to either the 1h ischemia or 5h ischemia groups.