viii Contents 



Cell Chemistry Laboratory 

 Department oj Biochemistry 

 Columbia University 



Unbalanced Growth and Death: A Study in Thymine Metabolism 77 



Seymour S. Cohen, Ph.D. 

 Professor of Biochemistry 

 Professor of Pediatrics 



University of Pennsylvania School of Medicine 

 The Childrens Hospital of Philadelphia 



Some Thoughts on the Biochemistry of the Steroid Hormones 85 



Lewis L. Engel, Ph.D. 



Assistant Professor of Biological Chemistry 

 Harvard Medical School 

 Associate Biochemist 

 Massachusetts General Hospital 

 Tutor in Biochemical Sciences 

 Harvard College 



The Biochemistry of the Bacterial Viruses 94 



E. A. Evans, Jr., Ph.D. 

 Professor and Chairman 

 Department of Biochemistry 

 University of Chicago 



The Biosynthesis of Peptide Bonds 106 



Joseph S. Fruton, Ph.D. 

 Professor of Chemistry 

 Chairman, Department of Biochemistry 

 Yale University 



On the Nature of Cancer 119 



Samuel Graff, Ph.D. 

 Professor of Biochemistry 

 Columbia University 

 The Francis Delafield Hospital 



Problems in Lipide Metabolism 133 



Samuel Gurin, Ph.D. 

 Professor and Chairman 

 Department of Biochemistry 

 University of Pennsylvania 



Tetrazoles as Carboxylic Acid Analogs 141 



Robert M. Herbst, Ph.D. 

 Professor of Chemistry 

 Kedzie Chemical Laboratory 

 Michigan Stale College 



The Structural Basis for the Differentiation of Identical Groups in 

 Asymmetric Reactions 156 



Hans Hirschmann, Ph.D. 



Associate Professor of Biochemistry 



Department of Medicine 



Western Reserve University 



