Survival of TH-positive cells in the striatum of animals grafted with ventral mesencephalic tissue. A, B, Two examples of graft deposits from a partially lesioned animal (A) and a complete lesion animal (B) are shown. We found that in both groups similar numbers of cells survived the transplantation (6865 ± 1374 and 5923 ± 988 cells in groups 3 and 4, respectively), showing that there was no effect of the second lesion on the grafted cells (unpaired t test, p = 0.58). Scale bar, 200 μm.