Fig. 1.

Reconstructions of wild-type C. crescentus swarmer cells. Representative ~12 nm thick slices through the centres of three C. crescentus swarmer cells are shown. At the convex side of the flagellated pole, a plate-like assembly (white arrows) is visible. The prominent base plate is connected to the inner membrane by thin, wall-like densities. A second, fainter layer of density parallel to the membrane can be discerned between the base plate and inner membrane. In most cases, pili (black arrows in A) and flagella (not shown) were also present at the same cell pole, but not in the same slice where the plate-like assembly was most visible (the case for the cells in B and C). Scale bar: 100 nm.