Comparison of the baseplate in the two conformations; reprinted from . A and B, Structure of the periphery of the baseplate in the hexagonal and star conformations, respectively. Colors identify different proteins as in the other figures: gp7 (red), gp8 (blue), gp9 (green), gp10 (yellow), gp11 (cyan) and gp12 (magenta). Directions of the long tail fibers are indicated with gray rods. The three domains of gp7 are labeled with letters A, B and C. The four domains of gp10 are labeled with Roman numbers I through IV. The C-terminal domain of gp11 is labeled with a black hexagon or black star in the hexagonal or star conformations, respectively. The baseplate sixfold axis is indicated by a black line. C and D, Structure of the proteins surrounding the hub in the hexagonal and star conformations, respectively. The proteins are colored as follows: spring green, gp5; pink, gp19; sky blue, gp27; violet, putative gp48 or gp54; beige, gp6-gp25-gp53; orange, unidentified protein at the tip of gp5. A part of the tail tube is shown in both conformations for clarity.