| BMP | Bone Morphogenetic Protein |
| TGF-β | Transforming Growth Factor β |
| FOP | Fibrodysplasia Ossificans Progressiva |
| BMPR2 | BMP Receptor type II |
| ActR-IIA | Activin Receptors type IIA |
| ActR-IIB | Activin Receptors type IIB |
| ALK1 | Activin Receptor-like Kinase 1 |
| ALK2 | Activin Receptor-like Kinase 2 |
| ALK3 | Activin Receptor-like Kinase 3 |
| ALK4 | Activin Receptor-like Kinase 4 |
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