Table 1. Apparent diffusion constant and immobile rhodopsin fraction in different species.

Species	Conditions	Da (average±SEM) 10−9 cm2.s−1	Immobile Rh fraction (average±SEM)
Ambystoma mexicanum
	pH 6.3	1.44±0.12 (15)	0.35±0.04
	+NH2OH	1.7±0.11 (14)	0.33±0.03
Rana temporaria
	pH 6.3	1.26±0.24 (7)	0.17±0.09
	+NH2OH	1.13±0.13 (8)	0.2±0.04
Bufo bufo
	pH 6.3	0.71±0.12 (6)	0.33±0.04
	+NH2OH	0.55±0.11 (5)	0.29±0.09
Gecko gecko
	pH 7.5	4.2±0.3 (11)	0.69±0.06 (19)

Statistics of apparent diffusion constant and immobile rhodopsin fraction in amphibians is presented separately for two conditions: at acidic pH and in the presence of hydroxylamine. There is no statistically significant difference between the results obtained in the two solutions. For gecko, data are obtained in standard Ringer at pH 7.5, no hydroxylamine. No correction for disks’ geometry is applied. Number of measured cells is given in parentheses.