Table 1.

Percentage of dLGN area occupied by ipsilateral fibers

	P4	P9	P30
WT	46.0  ± 0.5	19.2  ± 0.4	16.6  ± 0.3
β2−/−	45.6  ± 0.2	39.6  ± 1.0*	34.0  ± 1.3*
Physiol.		18.3  ± 0.6
Epib.		40.0  ± 0.9*†

Percentage of dLGN area occupied by ipsilateral fibers in wild-type (WT) and β2−/− mice at different postnatal ages, and in WT mice binocularly injected with 1 mM epibatidine (epib.) or physiological solution (physiol.) from P3 to P7 and analyzed at P9. Mean values ± SEM are shown. P4 (WT, n = 8; β2−/−, n = 6); P9 (WT, n = 6; β2−/−, n = 12; epib., n = 6; physiol., n = 6); P30 (WT, n = 10; β2−/−, n = 8). Statistical analysis according to one-way ANOVA followed by post hoc Fischer test for multiple comparisons (limited to P9): *, P < 0.0001 vs. WT; †, P < 0.0001 vs. physiol.