Table 1.

Groups of animals that were used in this study

	Age of injection	Age of study	Number of animals	#cells
Untreated kit		P34–P38	3	40
Untreated adult		P50	5	133
AS-ODN	P21–P22	P49–P50	5	86
AS-ODN	P36	P63	2	32
AS-ODN	P63	P90	2	31
Sense-ODN	P21–22	P49–P50	2	45
Missense-ODN	P21–P22	P49–P50	2	49

Three groups of animals were injected with antisense ODN (AS-ODN) at different ages. Control animals were injected with sense ODN or missense ODN at P21–P22. Two groups of untreated animals were studied around the time of eye opening (untreated kit) or around P50, when maturity of orientation selectivity is reached in the normal ferret.