↑Uchida, K., Shimizu, T., Makino, R., Sakaguchi, K., Iizuka, T., Ishimura, Y., Nozawa, T. and Hatano, M. (1983). "Magnetic and natural circular dichroism of L-tryptophan 2,3-dioxygenases and indoleamine 2,3-dioxygenase. I. Spectra of ferric and ferrous high spin forms". J. Biol. Chem.258: 2519–2525. PMID6600455.
↑Ren, S., Liu, H., Licad, E. and Correia, M.A. (1996). "Expression of rat liver tryptophan 2,3-dioxygenase in Escherichia coli: structural and functional characterization of the purified enzyme". Arch. Biochem. Biophys.333: 96–102. PMID8806758.
↑Leeds, J.M., Brown, P.J., McGeehan, G.M., Brown, F.K. and Wiseman, J.S. (1993). "Isotope effects and alternative substrate reactivities for tryptophan 2,3-dioxygenase". J. Biol. Chem.268: 17781–17786. PMID8349662.
↑Dang, Y., Dale, W.E. and Brown, O.R. (2000). "Comparative effects of oxygen on indoleamine 2,3-dioxygenase and tryptophan 2,3-dioxygenase of the kynurenine pathway". Free Radic. Biol. Med.28: 615–624. PMID10719243.
↑Littlejohn, T.K., Takikawa, O., Truscott, R.J. and Walker, M.J. (2003). "Asp274 and His346 are essential for heme binding and catalytic function of human indoleamine 2,3-dioxygenase". J. Biol. Chem.278: 29525–29531. PMID12766158.