1AH1:
reference: Solution structure of human CTLA-4 and delineation of a CD80/CD86 binding site conserved in CD28., Metzler WJ, Bajorath J, Fenderson W, Shaw SY, Constantine KL, Naemura J, Leytze G, Peach RJ, Lavoie TB, Mueller L, Linsley PS, Nat Struct Biol 1997 Jul;4(7):527-31. PMID: 9228944

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