"ACVR1B"@en. "Activin receptor-like kinase 4"@en. "Activin type IB receptor (ActR-IB)"@en. "ALK-4"@en. "ACTRIB"@en. "ACVRLK4"@en. "Activin A receptor, type IB"@en. "SKR2"@en. "Activin receptor-like kinase-4"@en. "Source: Freebase - The World's database". . "11479"^^. "Alk4"@en. . . . _:XrwgdRUt500. _:XrwgdRUt500 "alk4". _:XrwgdRUt500 .