2R52:
reference: Type I receptor binding of bone morphogenetic protein 6 is dependent on N-glycosylation of the ligand., Saremba S, Nickel J, Seher A, Kotzsch A, Sebald W, Mueller TD, FEBS J. 2007 Dec;275(1):172-83. Epub 2007 Dec 6. PMID: 18070108

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