Table 2.

Colonization efficiency of germ cells from infant boys with cryptorchidism.

Recipient	Testis	Patient ID	No. human germ cells prepareda	% human cells injected to recipienta	No. human germ cells actually injectedc	No. human germ cell colonies found after transplantationb	No. human germ cells found after transplantationb	% mean colonization efficiencyc
1	left	#1	56798	5 - 15	2840 - 8520	43	256	1.1
	right			5 - 15	2840 - 8520	51	303
2	left	#2	43097	5 - 15	2155 - 6465	21	128	0.6
	right			5 - 15	2155 - 6465	16	96
3	left	#3	10703	10 - 20	1070 - 2141	19	112	6.3
	right			5 - 15	535 - 1605	90	542
4	left	#4	3681	15 - 25	552 - 920	19	112	3.8
	right			25 - 35	920 - 1288	51	303
5	left	#5	6128	20 -30	1226 - 1838	85	511	9.0
	right			5 - 15	306 - 919	56	335
6	left	#6	19841	5 - 15	992 - 2976	77	463	3.0
	right		19841	100	19841	149	894
7	left	#7	11303	10 - 20	1130 - 2261	85	693	3.1
	right			60 - 70	6782 - 7912	37	187
8	left	#8	3025	5 - 15	151 - 454	75	702	18.6
	right			30 - 40	908 - 1210	43	427
9	left (7 weeks)	#9	14696	5 - 15	735 - 2204	10	96	0.5
	right (7weeks)			5 - 15	735 - 2204	0	0
10	left (6 weeks)	#10	7959	30 - 40	2388 - 3184	98	1127	1.8
	right (6 weeks)			100	7959	1	10
11	left (9 weeks)	#11	5361	60 - 70	3217 - 3753	86	942	6.4
	right (9 weeks)			10 - 20	536 - 1072	74	817

Recipient testis no. 1 to no. 8 were harvested 8 weeks after xenotransplantation; no.9 to no.11 were harvested 7, 6, 9 weeks after xenotransplantation.

^aestimated number; ^bcounted number; ^ccalculated number.

No. human germ cells actually injected = No. human germ cells prepared * % human cells actually injected to recipient; Mean colonization efficiency % = (No. human germ cell colonies obtained after transplantation/No. human germ cells actually injected) * 100.