Pseudomonas bacteriophage contains an inner body in its capsid

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Abstract
EM examination of the new virulent bacteriophage .vphi.KZ, specific for P. aeruginosa, has revealed an unusual structure in its capsid. In the center of the phage head is a cylinder of low electron density (inner body), surrounded by fibrous material which is packed around the inner body in a spool-like manner. The inner body itself has a springlike appearance. These structures disappear after adsorption of phage particles to bacteria. Various morphological forms, which can be interpreted as intermediate steps in .vphi.KZ DNA condensation, have been seen in ultrathin sections of .vphi.KZ-infected cells.