The six previously known fly rhodopsins account for the full function of photoreceptor cells in the fly's eyes, so although the fruit fly genome contained the sequence of a seventh rhodopsin, the role of Rh7 was unclear. (sciencedaily.com)
This is partly due to the much greater density of photoreceptor cells in a very small area in the center of the retina — the fovea. (sciencedaily.com)
The research indicates that Aipl1b gene is important for visual functions and maintenance of cone photoreceptors in the zebrafish. (sciencedaily.com)