4LI2:
reference: Crystal Structures of Lgr4 and Its Complex with R-Spondin1., Xu K, Xu Y, Rajashankar KR, Robev D, Nikolov DB, Structure. 2013 Jul 23. pii: S0969-2126(13)00242-6. doi:, 10.1016/j.str.2013.07.001. PMID: 23891289

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