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Nomura K, Tanaka H, Kikkawa Y, Yamaguchi M, Suzuki N (June 1991). "The specificity of sea urchin hatching enzyme (envelysin) places it in the mammalian matrix metalloproteinase family". Biochemistry. 30 (25): 6115–23. doi:10.1021/bi00239a005. PMID1711895.