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Fig. 6 | Zoological Letters

Fig. 6

From: Regeneration of the digestive tract of an anterior-eviscerating sea cucumber, Eupentacta quinquesemita, and the involvement of mesenchymal–epithelial transition in digestive tube formation

Fig. 6

Histology of the tissues at stage II. Cross sections of the body at stage II (4 dpe) were stained with HE, focusing on the mesentery at the anterior (a, b) and posterior (c, d) regions of the body. a, b Anterior mesentery. A mass of cells is present on the free edge of the mesentery. b is a high-magnification view of the boxed area in a. c Posterior tissue. A thickening of tissue (arrowhead) is observed at the connection of the mesentery and the cloaca. Respiratory trees are an organ continuous from the cloaca, and thus these two tissues could not be strictly distinguished. d Posterior tissue, anterior than c. A part of the mesentery with a free edge is shown. bw, body wall; cl/rt., cloaca or respiratory trees; gd, gonadal duct; lm, longitudinal muscle; mes, mesentery. Scale bars 500 μm in a, c, d; 50 μm in b

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