Table 1.

Experimental graft data for testis of immature and adult rat donors xenografted and collected 8 wk post grafting.

Tissue type	Number of mice grafted and analyzed	Seminal vesicle weight (mg)	Average graft weight (mg)	Number of grafts recovereda (%)	Number of healthy graftsb (%)	Number of grafts with meiotic germ cellsc (%)
Adult rat testis tissue	10	31 ± 2.1*	42 ± 3.8*	82.5 (33/40)*	0 (0/33)*	0 (0/0)*
Young rat testis tissue	10	128 ± 4.7	132 ± 6.2	100 (40/40)	75 (30/40)	83.3 (25/30)

^aTotal xenografts removed divided by the total number of xenografts grafted. ^bPercentage of recovered xenografts with intact seminiferous tubules. ^cPercentage of recovered xenografts with pachytene-stage spermatocytes. *Significantly different within the column (P < 0.05).