4ZM8:
reference: The crystal structures of two salivary cystatins from the tick Ixodes scapularis and the effect of these inhibitors on the establishment of Borrelia burgdorferi infection in a murine model., Kotsyfakis M, Horka H, Salat J, Andersen JF, Mol Microbiol. 2010 Jul;77(2):456-70. Epub 2010 Jun 1. PMID: 20545851

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