title: Fine structure and possible role of ampullae on tunic supply and attachment in a compound ascidian, Botryllus primigenus OKA.
mesh_terms: D000818:Animals; D002467:Cell Nucleus / Q000648:ultrastructure; D002816:Chordata, Nonvertebrate / Q000648:ultrastructure*; D003594:Cytoplasmic Granules / Q000648:ultrastructure; D004721:Endoplasmic Reticulum / Q000648:ultrastructure; D006056:Golgi Apparatus / Q000648:ultrastructure; D007365:Intercellular Junctions / Q000648:ultrastructure