Fig. 8

Histology of the tissues at stage IV. Cross sections of the body at stage IV focusing on the regenerated digestive tract. Sections a-f were made at positions indicated in g, of a specimen at 17 dpe. h The middle part of the animal with 1st descending, ascending and 2nd descending intestines, at 20 dpe, stained with TB. The slice was made roughly between b and c in a further regenerated animal with a single tube throughout the digestive tract. The 1st descending and ascending intestines could not be distinguished, since the intestines meandered. 1st descending or ascending intestine; 2dp, 2nd descending intestine. Arrowheads indicate mesenteries. Scale bar 50 μm in b-f; 100 μm in a; 200 μm in h