diff --git a/src/taxon_constraints/only_in_taxon.tsv b/src/taxon_constraints/only_in_taxon.tsv
index 8803a566a2..6f7c39e6b4 100644
--- a/src/taxon_constraints/only_in_taxon.tsv
+++ b/src/taxon_constraints/only_in_taxon.tsv
@@ -937,3 +937,4 @@ GO:0043716	2-hydroxy-3-keto-5-methylthiopentenyl-1-phosphate phosphatase activit
 GO:0160237	D-Ala-D-Ala dipeptidase activity	NCBITaxon:2	Bacteria	
 GO:0140095	cytoplasmic lattice	NCBITaxon:40674	Mammalia	
 GO:0140094	structural constituent of cytoplasmic lattice	NCBITaxon:40674	Mammalia	
+GO:0034354	'de novo' NAD biosynthetic process from tryptophan	NCBITaxon:2759	Eukaryota