FIG. 1.

(a) Phase-contrast photomicrograph of cells of strain Ellin428. Bar, 10 μm. (b) Electron micrograph of whole cells of strain Ellin428. Bar, 2 μm. (c) Electron micrograph of thin section of a dividing cell of strain Ellin428, showing the electron dense material that was interpreted to be DNA. Bar, 500 nm. (d) Electron micrograph of a thin section part of the cell envelope of a cell of strain Ellin428, showing the two well-stained layers separated by a poorly stained layer or region. Bar, 100 nm.