2B7F:
reference: Crystal structure of human T cell leukemia virus protease, a novel target for anticancer drug design., Li M, Laco GS, Jaskolski M, Rozycki J, Alexandratos J, Wlodawer A, Gustchina A, Proc Natl Acad Sci U S A. 2005 Dec 20;102(51):18332-7. Epub 2005 Dec 13. PMID: 16352712

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