WNT1 and neoplasm: Differences in the percentage of Ki-67 positive cells were not detected in MMTV-Wnt1 and MMTV-Wnt1;MMTV-Wnt5a tumors (Figure 1C–E, n = 6 MMTV-Wnt1 tumors, 3 fields per tumor; n = 5 MMTV-Wnt1;MMTV-Wnt5a tumors, 3 fields per tumor).