Table 1. Voltage sensitivity depends on the positional origin of OHCs from one guinea pig colony (normal mammalian phenotype).

Cells and region	${\alpha }_B$ (V−1)	z	OBS	P value
(a) basal	36.4 (1.5)	0.93 (0.04)	4	0.0227
(a) apical	33.8 (1.8)	0.86 (0.05)	11
(b) basal	37.3 (2.7)	0.96 (0.07)	12	<0.0001
(b) apical	32.3 (3.0)	0.83 (0.08)	16
(c) basal	31.3 (3.8)	0.80 (0.10)	11	0.5294
(c) apical	30.5 (3.4)	0.78 (0.09)	30

P values determined with one-way ANOVA. (a) and (b) represent observations with cells extracted from animals of normal phenotype with and without XE991 in the bath, and (c) represents observations with cells extracted from albinos. ANOVA effect tests revealed no significant influence of adding XE991 to the bath (P value = 0.7551). The SD of the mean is shown in parenthesis. OBS, number of observations.