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| PR:Q55DB4 | tryptophan 2,3-dioxygenase (Dictyostelium discoideum) | | |  | | |
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| PR:P20351 | tryptophan 2,3-dioxygenase (fruit fly) | | |  | | |
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| PR:P48775-1 | tryptophan 2,3-dioxygenase isoform 1 (human) | | |  | | |
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| PR:P48776-1 | tryptophan 2,3-dioxygenase isoform 1 (mouse) | | |  | | |
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| PR:Q09474-1 | tryptophan 2,3-dioxygenase isoform a (worm) | | |  | | |
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| PR:Q09474-3 | tryptophan 2,3-dioxygenase isoform c (worm) | | |  | | |
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| PR:A7MBU6 | tryptophan 2,3-dioxygenase A (zebrafish) | | |  | | |
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| PR:P48775-1 | tryptophan 2,3-dioxygenase isoform 1 (human) | | |  | | |
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| PR:P48776-1 | tryptophan 2,3-dioxygenase isoform 1 (mouse) | | |  | | |
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