Extended Data Fig. 4. Cryo-electron tomography of Kuenenia stuttgartiensis.
a, Segmented tomogram of a K. stuttgartiensis cell. The S-layer is shown in blue, the anammoxosomal membrane in beige and the tubules in orange. The fourfold-symmetrical particles visible in the slice through the tomogram (grey) are hydrazine dehydrogenase complexes76. b, Subtomogram average. The top and middle panels show views perpendicular to and along the tubule axis, respectively, and the bottom panel the FSC curve. c, the highest density (white) in the connecting density corresponds to the heme sites.