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Fig. 2. Ultrastructure (TEM) of the tube foot connective tissue layer in Paracentrotus lividus (A,C,E) and in Marthasterias glacialis (B,D,F,G). Arrows indicate juxtaligamental-like cells intercalated between collagen fibres. (A,B) General views of a transverse section through the tube foot stem. (C,D) Details of the outer connective tissue sheath. (E,F) Juxtaligamental-like cells. (G) Detail of the microfibrillar network. Abbreviations: BL, basal lamina; Fi, fibres; G, granules; G1 and G2, type 1 and 2 granules; ICS, inner connective tissue sheath; OCS, outer connective tissue sheath; NP, nerve plexus; M, myomesothelium; MN, microfibrillar network; Mx, matrix.





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