| Keyword | CPC | PCC | Volume | Length string | Score |
|---|---|---|---|---|---|
| photopsin | 0.73 | 0.7 | 359 | 9 | 42 |
| photopsin and iodopsin | 0.57 | 0.7 | 7023 | 22 | 37 |
| photopsin biology | 0.04 | 0.8 | 4068 | 17 | 39 |
| photopsin science | 0.2 | 0.6 | 1099 | 17 | 77 |
| photopsin function | 0.29 | 0.6 | 8185 | 18 | 80 |
| photopsin wikipedia | 0.3 | 0.1 | 6065 | 19 | 26 |
