Gap junctions in ciliary epithelium under conditions of oxygenation (upper) and anoxia (lower), in tissue prepared by ultrarapid freezing using liquid helium. Under oxygenated conditions, the connexo...

Representative examples of gap junctions from vertebrates (ciliary epithelium from the eye of a Macaca mulatta, upper) and invertebrates (inverted gap junctions from cells of the mid-gut of the horses...

Images of desmosomes from conventional EM and freeze fracture preparations show transmembrane filaments that link two hemidesmosomes. Upper: section of a cell boundary in the ciliary epithelium of th...