. "UK" . "Nucleic Acids Res." . "NARHAD" . "0389" . "0305-1048" . "18" . "6665" . "De Novo Purine Nucleotide Biosynthesis: Cloning of Human and Avian Cdna'S Encoding the Trifunctional Glycinamide Ribonucleotide Synthetase-Aminoimidazole Ribonucleotide Synthetase-Glycinamide Ribonucleotide Transformylase by Functional Complementation in E. Coli" . . . . . .