Activin Receptor Type-1B

**Semantic type:** Amino Acid, Peptide, or Protein|Enzyme|Receptor

**Definition:** Activin receptor type-1B (505 aa, ~57 kDa) is encoded by the human ACVR1B gene. This protein plays a role in protein phosphorylation, signal transduction, cell cycle regulation and apoptosis.

**Synonyms:** - ACTR-IB - ALK-4 - Activin A Receptor, Type II-Like Kinase 4 - Activin A Type IB Receptor - Activin Receptor Type IB - Activin Receptor-Like Kinase 4 - EC 2.7.11.30 - SKR2 - Serine/Threonine-Protein Kinase Receptor R2