ACTIVIN RECEPTOR TYPE I PRECURSOR (EC 2.7.1.37) (ACTR-I) (SERINE/THREONINE-PROTEIN KINASE RECEPTOR R1) (SKR1) (ACTIVIN RECEPTOR-LIKE KINASE 2) (ALK-2) (TGF-B SUPERFAMILY RECEPTOR TYPE I) (TSR-I). [Source:SWISSPROT;Acc:Q04771]