3FF7:
reference: Structure of natural killer cell receptor KLRG1 bound to E-cadherin reveals basis for MHC-independent missing self recognition., Li Y, Hofmann M, Wang Q, Teng L, Chlewicki LK, Pircher H, Mariuzza RA, Immunity. 2009 Jul 17;31(1):35-46. PMID: 19604491

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