Biosynthesis of N-(purin-6-ylcarbamoyl)-l-threonine riboside. Incorporation of l-threonine in vivo into modified nucleoside of transfer ribonucleic acid

Abstract
L-[U-14C]Threonine is incorporated into N-(purin-6-ylcarbamoyl)-l-threonine riboside of rat liver and Escherichia coli tRNA. A pathway is suggested for the biosynthesis of this nucleoside.