| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| 2 types of photoreceptors | 0.19 | 0.2 | 1595 | 37 | 25 |
| 2 | 0.87 | 0.1 | 9696 | 94 | 1 |
| types | 0.91 | 0.3 | 9089 | 22 | 5 |
| of | 1.19 | 1 | 8972 | 34 | 2 |
| photoreceptors | 1.9 | 0.3 | 5372 | 83 | 14 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| 2 types of photoreceptors | 1.73 | 0.6 | 3718 | 83 |
