Fig. 6. Ultrastructure of the mesoglea in the chimeric region of a heterograft (24h old). (A) Overview of the graft site and (B) its schematic representation. Oli-ecto, H. oligactis ectoderm; Vul-ecto, H. vulgaris ectoderm; Oli-endo, H. oligactis endoderm; Vul-endo, H. vulgaris endoderm. Frames labelled C—F are enlarged in (C—F), respectively. Note the abnormal morphology of mesoglea (asterisk) in the chimeric region (D—F). (G) Mesoglea in control H. vulgaris polyps. Scale bars, 10 µm (A); 5 µm (C—G).