Flavoprotein that catalyzes the oxidative deamination of d-amino acids to the corresponding α-keto acids. Found in the kidney and liver of nearly all mammals studied. Isoln from pig kidney: Krebs, Enzymologia 7, 53 (1939); Straub, Nature 141, 603 (1938); Negelein, Brmel, Biochem. Z. 300, 225 (1939); Massey et al., Biochim. Biophys. Acta 48, 1 (1961) DOI PubMed; from sheep kidney: Burton, Methods Enzymol. 2, 199 (1955) DOI. Physical properties: Yagi et al., J. Biochem. 61, 580 (1967) PubMed. Partial structure: Kotaki et al., ibid. 598 PubMed. Studies on specificity and inhibition: Dixon, Kleppe, Biochim. Biophys. Acta 96, 368 (1965). Reaction intermediates: K. Yagi, Front. Physicochem. Biol., Proc. Int. Symp. 1977, B. Pullman, Ed. (Academic Press, New York, 1978) pp 299-308. Review: Meister, Wellner in The Enzymes 7, P. Boyer et al., Eds. (Academic Press, New York, 1963) pp 634-648.