FIG. 5.

Multiple-tail procapsids. Shown are electron micrographs of negatively stained particles from the procapsid peak fraction of the wild-type phage-infected portal protein host. Tailspikes were detected on approximately 1% of the total procapsids. Because tailspikes attach only to portal vertices, they serve as a marker for the presence of portals within procapsid shells. No multiple-tail procapsids were detectable in the wild-type phage-infected β-Gal host, and no multiple-tail procapsids were present in any samples derived from Gly287Glu infections.