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Table 4. Development of immature rat donor germ cells in recipient mouse testes 13 weeks after transplantation^*

Treatment Group	No. of Testes	Weight per Testis (mg)	Total Tubule Differentiation Index (%)	Viable Cells Injected per Testis (x 10⁴)	Tubule Cross-Sections That Were GFP-Positive (%)	GFP-Positive Tubule Cross-Sections With Differentiated Germ Cells (%)

Irradiation^*	14	47 ± 3	69 ± 4	76 ± 7	35 ± 5	76 ± 4
Busulfan ${dagger}$	8	90 ± 16	93 ± 2	67 ± 10	16 ± 5	36 ± 10

*Treatment consisted of 1.5 + 12 Gy administered 24 hours apart
${dagger}$ Treatment consisted of a 44-mg/kg dose