TY - JOUR T1 - STUDIES ON CRYSTALLINE INSULIN IV. THE ISOLATION OF ARGININE, HISTIDINE, AND LEUCINE JF - Journal of Pharmacology and Experimental Therapeutics JO - J Pharmacol Exp Ther SP - 387 LP - 396 VL - 32 IS - 5 AU - H. JENSEN AU - OSKAR WINTERSTEINER AU - VINCENT DU VIGNEAUD Y1 - 1928/03/01 UR - http://jpet.aspetjournals.org/content/32/5/387.abstract N2 - Arginine, histidine and leucine have been isolated from hydrolyzed crystalline insulin, proving the presence of these amino acids in the insulin molecule. From the lysine fraction a picrate has been obtained, the properties of which indicate the presence of lysine. By means of the method of Koessler and Hanke the amount of histidine has been estimated. ER -