1EX4:
reference: Crystal structure of the HIV-1 integrase catalytic core and C-terminal domains: a model for viral DNA binding., Chen JC, Krucinski J, Miercke LJ, Finer-Moore JS, Tang AH, Leavitt AD, Stroud RM, Proc Natl Acad Sci U S A 2000 Jul 18;97(15):8233-8. PMID: 10890912

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