https://www.ncbi.nlm.nih.gov/protein/5BQC_B
Chain B, Frizzled-4 - Protein - NCBI
frizzled 4chainbprotein
https://www.rcsb.org/structure/5BQC
RCSB PDB - 5BQC: Crystal structure of Norrin in complex with the cysteine-rich domain of Frizzled 4...
Crystal structure of Norrin in complex with the cysteine-rich domain of Frizzled 4 and sucrose octasulfate