Peterkofsky, B Use of a new radioassay for tryptophan oxygenase to study the development of the enzyme in chick embryos. [electronic resource] - Archives of biochemistry and biophysics Dec 1968 - 637-45 p. digital Publication Type: Journal Article ISSN: 0003-9861 Standard No.: 10.1016/0003-9861(68)90073-8 doi Subjects--Topical Terms: Age FactorsAmidohydrolases--metabolismAnimalsCarbon IsotopesChick Embryo--enzymologyFormatesKynurenineLiver--embryologyMethodsRatsSpectrophotometryTryptophan Oxygenase--analysis