1LYB:
reference: Crystal structures of native and inhibited forms of human cathepsin D: implications for lysosomal targeting and drug design., Baldwin ET, Bhat TN, Gulnik S, Hosur MV, Sowder RC 2nd, Cachau RE, Collins J, Silva AM, Erickson JW, Proc Natl Acad Sci U S A 1993 Jul 15;90(14):6796-800. PMID: 8393577

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