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Department of Pediatrics, New York University, the Children's Medical Service, Bellevue Hospital, and the Public Health Research Institute, City of New York
An intake of 0.4 mg of riboflavin per day by the infant served to maintain adequate blood levels, to maintain the urinary excretion at the upper limit of the zone of minimum excretion, and was not associated with clinical evidences of deficiency.
The limitations of these studies and the relation of the above figure to the minimum riboflavin requirements of the infant are discussed.
2 Present address: Department of Chemistry, Columbia University, New York, N. Y.
3 Present address: Department of Pharmacology, Washington University, School of Medicine, St. Louis, Mo.
4 Present address: Department of Biochemistry, University of Illinois, College of Medicine, Chicago, Ill.
Manuscript received 16 May 1949.