Phage head size determination and head protein cleavage in vitro.

Centrifugation, Density Gradient Coliphages/physiology,radiation effects,ultrastructure DNA Viruses/physiology,radiation effects,ultrastructure DNA, Viral/analysis Electrophoresis, Polyacrylamide Gel Escherichia coli Helper Viruses/physiology Kinetics Macromolecular Substances Magnesium/pharmacology Microscopy, Electron Mutation Protein Binding Radiation Effects Sonication Sulfur Radioisotopes Ultraviolet Rays Viral Plaque Assay Viral Proteins/analysis,metabolism

DNA, Viral Macromolecular Substances Sulfur Radioisotopes Viral Proteins Magnesium