| cytokine receptor binding | GO:0005126 | 4.14 |
| transmembrane receptor protein serine/threonine kinase binding | GO:0070696 | 7.1 |
| hormone activity | GO:0005179 | 4.95 |
| cytokine activity | GO:0005125 | 4.34 |
| peptide binding | GO:0042277 | 4.22 |
| growth factor activity | GO:0008083 | 4.66 |
| receptor serine/threonine kinase binding | GO:0033612 | 7.03 |
| amide binding | GO:0033218 | 4.14 |
| transforming growth factor beta receptor binding | GO:0005160 | 5.81 |
| hormone binding | GO:0042562 | 5.53 |
| GO:0070699 | 8.64 |
| peptide hormone binding | GO:0017046 | 6.13 |
| inhibin binding | GO:0034711 | 7.95 |
| binding | GO:0005488 | 0.18 |
| protein binding | GO:0005515 | 0.46 |
| receptor binding | GO:0005102 | 2.43 |
| protein heterodimerization activity | GO:0046982 | 3.64 |
| protein dimerization activity | GO:0046983 | 2.72 |
| identical protein binding | GO:0042802 | 2.63 |
| activin receptor binding | GO:0070697 | 8.13 |