FIGURE 1.

Sections through the bacteriophage Φ6 procapsid reconstructions at 70 Å (A, C, E, and G) and 30 Å (B, D, F, and H) from the procapsid center. A and B, the wild type procapsid showing faint ring-like densities (white circles) on the 3-fold axes between the recessed 5-fold vertices, as well as the hexameric P4 protein (black arrow). The approximate locations of the 3- and 5-fold axes are shown in B. C and D, the procapsid of the P1 mutant with prominent ring-like densities and some density in the center. E and F, the procapsid lacking the P2 molecule has no ring-like densities between the 5-fold vertices. G and H, the procapsid lacking the P7 protein has density between the 5-fold vertices.