Table 1.

Summary of ERG parameters from Gcgr^−/− mice

Age, months	a-wave			b-wave
	Log It	Log I0	Vmax, μV	log It	log I0	Vmax, μV
≤8	−0.9	0.1 ± 0.1	230 ± 10	−3.8	−2.4 ± 0.1	470 ± 20
9	−0.9	−0.2 ± 0.1	160 ± 10	−3.3	−2.1 ± 0.1	420 ± 20
10	−1.0	−0.2 ± 0.2	160 ± 20	−2.9	−2.0 ± 0.1	310 ± 10
11	−0.7	NT	NT	−2.9	−2.3 ± 0.3	200 ± 20
12	−0.4	−0.2 ± 0.1	90 ± 10	−2.2	−1.7 ± 0.3	180 ± 30
13	−0.4	−0.3 ± 0.6	80 ± 60	−1.8	−2.1 ± 0.4	100 ± 30

Data are mean ± SEM; n = 4–12; V_max, maximum amplitude; NT, not tested.