| cytokine receptor binding | GO:0005126 | 4.14 |
| cytokine activity | GO:0005125 | 4.34 |
| growth factor activity | GO:0008083 | 4.66 |
| protein binding | GO:0005515 | 0.46 |
| receptor serine/threonine kinase binding | GO:0033612 | 7.03 |
| receptor regulator activity | GO:0030545 | 5.91 |
| transforming growth factor beta receptor binding | GO:0005160 | 5.81 |
| type I activin receptor binding | GO:0070698 | 9.05 |
| receptor agonist activity | GO:0048018 | 6.97 |
| binding | GO:0005488 | 0.18 |
| signal transducer activity | GO:0004871 | 2.28 |
| morphogen activity | GO:0016015 | 7.79 |
| receptor binding | GO:0005102 | 2.43 |
| molecular function regulator | GO:0098772 | 2.51 |
| receptor activator activity | GO:0030546 | 6.27 |
| transmembrane receptor protein serine/threonine kinase binding | GO:0070696 | 7.1 |
| activin receptor binding | GO:0070697 | 8.13 |