A subtype of bone morphogenetic protein receptors with high affinity for BONE MORPHOGENETIC PROTEINS. They can interact with and undergo PHOSPHORYLATION by BONE MORPHOGENETIC PROTEIN RECEPTORS, TYPE II. They signal primarily through RECEPTOR-REGULATED SMAD PROTEINS.

Synonyms: Serine Threonine Protein Kinase Receptor R6, BMPR IB Receptor, BMP Type I Receptor, BMPR-I Receptors, BMP Type IA Receptor, Serine-Threonine Protein Kinase Receptor R6, EC 2.7.11.30, BMPR-IA Receptor, BMPR I Receptors, Type I Bone Morphogenetic Protein Receptors, Bone Morphogenetic Protein Receptor, Type IB, BMP Type IB Receptor, Activin Receptor Like Kinase 6, Type IA Bone Morphogenetic Protein Receptor, BMPR IA Receptor, Bone Morphogenetic Protein Receptor Type I, Bone Morphogenetic Protein Receptors, Type I, Activin Receptor Like Kinase 3, Activin Receptor-Like Kinase 3, BMPR-IB Receptor, Type IB Bone Morphogenetic Protein Receptor, Activin Receptor-Like Kinase 6, Bone Morphogenetic Protein Receptor, Type IA