title: Tubular elements - a new structure in blue-green algal cells.
abstract: New cell inclusions, 'tubular elements' are described from the blue-green alga Calothrix marchica. These structures are found in about 20% of all cells observed. They are 18-22 nm in diameter, apparently composed of sub-units of which the estimated number, as seen in transverse section, is 8-10.
mesh_terms: D000458:Cyanobacteria / Q000648:ultrastructure*; D003599:Cytoskeleton / Q000648:ultrastructure; D008854:Microscopy, Electron; D008870:Microtubules / Q000648:ultrastructure