Table 1.

Engraftment efficiency of MT-c17.2 or GDNF-c17.2 cells in the adult striatum of wild-type and nude CD-1 mice

	14 d WT	30 d WT	120 d WT	120 d Nude
MT-c17.2 grafts (β-Gal-positive)	3 /3  (100%)	3 /8  (37.5%)	0 /8  (0%)	3 /3  (100%)
GDNF-c17.2 grafts (GDNF-positive)	4 /4  (100%)	5 /12  (41.6%)	1 /8  (12.5%)	3 /3  (100%)

Animals showing β-Gal- or GDNF-immunoreactive cells in the striatum at the indicated time points were considered as positive. In general, most of the animals showed either a large engraftment (see Figs. 3, 4) or absence of positive cells. The engraftment efficiency of MT-c17.2 or GDNF-c17.2 cells was 100% in nude CD-1 mice (Nude) but declined over time in wild-type mice (WT).