Fluorescamine: A Reagent for Assay of Amino Acids, Peptides, Proteins, and Primary Amines in the Picomole RangeSidney Udenfriend, Manfred Weigele, W. Leimgruber et al.|Science|1972Cited by 2.7k
Tyrosine HydroxylaseToshiharu Nagatsu, Sidney Udenfriend, Morton Levitt|Journal of Biological Chemistry|1964Cited by 2.1k
Fluorometric assay of proteins in the nanogram rangePeter Böhlen, Sidney Udenfriend, Wallace Dairman et al.|Archives of Biochemistry and Biophysics|1973Cited by 1.6k
A specific method for the analysis of hydroxyproline in tissues and urineDarwin J. Prockop, Sidney Udenfriend|Analytical Biochemistry|1960Cited by 1.1k
ELUCIDATION OF THE RATE-LIMITING STEP IN NOREPINEPHRINE BIOSYNTHESIS IN THE PERFUSED GUINEA-PIG HEARTMorton Levitt, Sidney Udenfriend, Albert Sjoerdsma et al.|Journal of Pharmacology and Experimental Therapeutics|1965Cited by 1k