Morris, D. R., and Pardee, A. B. Multiple Pathways of Putrescine Biosynthesis in Escherichia coli. J. Biol. Chem. 241, 3129-3135 (1966).

Morris, D. R., and Koffron, K. L. Urea Production and Putrescine Biosynthesis in Escherichia coli. J. Bacteriol. 94, 1516-1519 (1967).

Morris, D. R., and Koffron, K. L. Putrescine Biosynthesis in Escherichia coli. Regulation through Pathway Selection. J. Biol. Chem. 244, 6094-6099 (1969).

Morris, D. R.,and Jorstad, C. M. Isolation of Conditionally Putrescine-Deficient Mutants of Escherichia coli. J. Bacteriol. 101, 731-737 (1970).

Wu, W. H., and Morris, D. R. Biosynthetic Arginine Decarboxylase from Escherichia coli. Purification and Properties. J. Biol. Chem. 248, 1687-1695 (1973).

Wu, W. H., and Morris, D. R. Biosynthetic Arginine Decarboxylase from Escherichia coli. Subunit Interations and the Role of Magnesium Ion. J. Biol. Chem. 248, 1696-1699 (1973).

Applebaum, D., Sabo, D. L., Fischer, E. H., and Morris, D. R. Biodegradative Ornithine Decarboxylase of Escherichia Coli. Purification, Properties and Pyridoxal 5'-Phosphate Binding Site. Biochemistry 14, 3675-3681 (1975).

Applebaum, D. M., Dunlap, J. C., and Morris, D. R. Comparison of the Biosynthetic and Biodegradative Ornithine Decarboxylase of Escherichia coli. Biochemistry 16, 1580-1584 (1977).

Morris, D. R., and Boeker, E. A. Biosynthetic and Biodegradative Ornithine and Arginine Decarboxylases from Escherichia coli. Methods in Enzymology 94, 125-134 (1983).