1. Ribonucleic acid in the immune response

   • Susumu Mitsuhashi
   • Kazuko Saito
   • Nobuo Yamaguchi

   Review Articles Pages: 131 - 147

2. The human plasma fibrinolytic system: Regulation and control

   • Kenneth C. Robbins

   Review Articles Pages: 149 - 157

3. H2B nucleohistone — phospholipid interactions. Thermal denaturation and ultrastructural analysis

   • S. Capitani
   • N. M. Maraldi
   • F. A. Manzoli

   General Articles Pages: 159 - 166

4. The association of serum proteins with peripheral blood cells at low ionic strength: Ultrastructural examination

   • Nancy G. Saravia
   • Sandra Derryberry
   • J. P. Robinson

   General Articles Pages: 167 - 172

5. Characterization of the amino acids of bovine fibrinogen involved in the fibrinogen-thrombin interaction of the blood clotting process. Comparison with the milk clotting process

   • Nicholas M. C. Kaye
   • Pierre Jollès

   General Articles Pages: 173 - 182

6. Separate effect of hydroxyurea on the initiation and elongation of DNA synthesis in BHK cells

   • Rafael Manso-Martínez
   • Jesús Avila

   General Articles Pages: 183 - 189

7. Poem

   • Liane Reif-Lehrer

   Arts in Science Pages: 191 - 191

8. Reflections on a title of Wm. Wallace Cleland

   • T. Baker

   Arts in Science Pages: 192 - 192