| Answer | Crossword Clue |
|---|---|
| retinals | RETINAL, a pigment in the retina, also RETINENE |
| retinenes | RETINENE, a pigment in the retina, also RETINAL |
| retinal | a pigment in the retina, also RETINENE |
| retinene | a pigment in the retina, also RETINAL |
| iodopsin | photosensitive violet pigment that occurs in the cones of the retina and is transformed by light into retinal and an opsin protein |
