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Fig. 7. Longitudinal sections through the discs of the tube feet of Paracentrotus lividus (A,C) and Asterias rubens (B,D; the section goes through the margin of the disc to show the connective tissue radial lamellae). Abbreviations: AE, adhesive epidermis; CL, connective tissue radial lamellae; CS, connective tissue septa; CT, connective tissue layer; Di, diaphragm; DP, distal pad; L, lumen; Sk, skeleton; TP, terminal plate.