start stage end stage long double cone cell zebrafish_anatomy red-sensitive cone cell unequal double cone cell ZFA:0005945 Retinal cone cell with a long outer segment that form pairs with the short double cone cell as part of the retinal cone mosaic pattern. The long double cone cell is positioned immediately adjacent to the long single cone cell and is sensitive to red light. The double cone cells have membrane projections at the level of the lobed nucleus. 2021-07-09T09:06:25Z retinal cone cell hatching:long-pec adult