Experimental Factor Ontology term EFO_0021733 (3-Indolepropionic acid to 1,4-dihydro-1-Methyl-4-oxo-3-pyridinecarboxamide ratio) is quantification of the ratio of 3-Indolepropionic acid to 1,4-dihydro-1-Methyl-4-oxo-3-pyridinecarboxamide ratio in a sample.