Table 1.

Rod and cone inputs to somata and axon terminals of the mice used in this study

	Soma	Axon terminal
Wild type	rod + cone	rod + cone
Rhodopsin−/−	cone	cone
CNGA3−/−	rod	rod
Cx36−/−	?	rod + cone
CNGA3−/−/Cx36−/−	−	rod

The photoreceptor contributions to the somatic light responses in the Cx36-deficient retinas could not be determined because the wild-type light responses were strongly dominated by cone inputs. However, the complete lack of light responses in the somata of CNGA3/Cx36 double knock-out mice indicates that rod signals cannot pass to the horizontal cell somata in the absence of rod–cone coupling.