Yamamoto Y, Kurata M, Watabe S, Murakami R, Takahashi SY (April 2002). "Novel cysteine proteinase inhibitors homologous to the proregions of cysteine proteinases". Current Protein & Peptide Science. 3 (2): 231–8. doi:10.2174/1389203024605331. PMID12188906.
Ménard R, Khouri HE, Plouffe C, Dupras R, Ripoll D, Vernet T, et al. (July 1990). "A protein engineering study of the role of aspartate 158 in the catalytic mechanism of papain". Biochemistry. 29 (28): 6706–13. doi:10.1021/bi00480a021. PMID2397208.
Chan SC, Bürki A, Bonél HM, Benneker LM, Gantenbein-Ritter B (March 2013). "Papain-induced in vitro disc degeneration model for the study of injectable nucleus pulposus therapy". The Spine Journal. 13 (3): 273–83. doi:10.1016/j.spinee.2012.12.007. PMID23353003.
Yamamoto Y, Kurata M, Watabe S, Murakami R, Takahashi SY (April 2002). "Novel cysteine proteinase inhibitors homologous to the proregions of cysteine proteinases". Current Protein & Peptide Science. 3 (2): 231–8. doi:10.2174/1389203024605331. PMID12188906.
Ménard R, Khouri HE, Plouffe C, Dupras R, Ripoll D, Vernet T, et al. (July 1990). "A protein engineering study of the role of aspartate 158 in the catalytic mechanism of papain". Biochemistry. 29 (28): 6706–13. doi:10.1021/bi00480a021. PMID2397208.
Chan SC, Bürki A, Bonél HM, Benneker LM, Gantenbein-Ritter B (March 2013). "Papain-induced in vitro disc degeneration model for the study of injectable nucleus pulposus therapy". The Spine Journal. 13 (3): 273–83. doi:10.1016/j.spinee.2012.12.007. PMID23353003.