Dai W, Gupta SL (abril de 1990). «Molecular cloning, sequencing and expression of human interferon-gamma-inducible indoleamine 2,3-dioxygenase cDNA». Biochemical and Biophysical Research Communications. 168 (1): 1–8. PMID2109605. doi:10.1016/0006-291X(90)91666-G
Najfeld V, Menninger J, Muhleman D, Comings DE, Gupta SL (1993). «Localization of indoleamine 2,3-dioxygenase gene (INDO) to chromosome 8p12-->p11 by fluorescent in situ hybridization». Cytogenetics and Cell Genetics. 64 (3-4): 231–2. PMID8404046. doi:10.1159/000133584
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Dai W, Gupta SL (abril de 1990). «Molecular cloning, sequencing and expression of human interferon-gamma-inducible indoleamine 2,3-dioxygenase cDNA». Biochemical and Biophysical Research Communications. 168 (1): 1–8. PMID2109605. doi:10.1016/0006-291X(90)91666-G
Najfeld V, Menninger J, Muhleman D, Comings DE, Gupta SL (1993). «Localization of indoleamine 2,3-dioxygenase gene (INDO) to chromosome 8p12-->p11 by fluorescent in situ hybridization». Cytogenetics and Cell Genetics. 64 (3-4): 231–2. PMID8404046. doi:10.1159/000133584