title: Polymorphic nexuses in the earthworm Lumbricus terrestris.
mesh_terms: D000818:Animals; D049872:Bivalvia / Q000648:ultrastructure; D005614:Freeze Fracturing; D007365:Intercellular Junctions / Q000648:ultrastructure*; D007422:Intestines / Q000648:ultrastructure; D008854:Microscopy, Electron; D008121:Nephropidae / Q000648:ultrastructure; D009420:Nervous System / Q000648:ultrastructure; D009835:Oligochaeta / Q000648:ultrastructure*; D010802:Phylogeny