Kito Y, Seki T, Suzuki T, Uchiyama I
Vision Res. 1986;26(2):275-9. doi: 10.1016/0042-6989(86)90023-4.
3-Dehydroretinal was found in the retina of a bioluminescent squid, Watasenia scintillans. The possible vitamin A2-visual pigment was localized in the ventral part of the eye and its proportion was about 15% of the total visual pigment.