Table 1.

Morphometric results of the experimental groups±standard deviation

	Group I (control)	Group II (busulfan)	Group III (recovery)	Group IV (G-CSF)
Mean height of spermatogenic epithelium	73.8±3.4	22.4±2.7*	29.9±2.1*	61.4±2.7**
Mean number of of positive CD34 cells on day 5	0.00±0.00	2.3±1.3*	-	15.7±2.1#
Mean number of of positive CD34 cells after 4 weeks	0.000.00	2.00±0.8*	-	0.00±0.00†
Mean number of positive CD34 cells after 6 weeks	-	-	1.4±0.3∞	-
Mean number of positive PCNA cells	48.9±2.6	7.2±1.3∞	16.5±2.1*	39.2±2.6‡
Mean number of positive caspase-3 cells	4.4±12	27.00±1.8∞	21.6±2.2*	7.1±1.9**

*Significant compared to Group I, **Significant compared to both Groups II and III but nonsignificant compared to Group I, ^#Significant compared to both Groups I, II, ^†Significant compared to Group II and IV on day 5, ^∞Significant compared to Group I and Group IV, ^‡Significant compared to Group II. PCNA: Proliferating cell nuclear antigen, G-CSF: Granulocyte colony-stimulating factors