3BSQ:
reference: Crystal structure of human epidermal kallikrein 7 (hK7) synthesized directly in its native state in E. coli: insights into the atomic basis of its inhibition by LEKTI domain 6 (LD6)., Fernandez IS, Standker L, Magert HJ, Forssmann WG, Gimenez-Gallego G, Romero A, J Mol Biol. 2008 Apr 11;377(5):1488-97. Epub 2008 Feb 9. PMID: 18329042

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