sort by Rank | Alpha
| Possible Meanings | Rank |
| cdk inhibitors, including p21 | ** |
| CDK inhibitory proteins , mainly p21 | ** |
| cell-cycle inhibitors p16(INK4), p21 | ** |
| A-CDK2, induced by p21 | ** |
| Cdk2 inhibitors p27(Kip1) and p21 | ** |
| cycle regulators, including p107, p130, p21 | ** |
| cyclin-dependent kinase inhibitor, p21 | ** |