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Fig. 4. Variation of the mechanical properties of the tube foot stem of Paracentrotus lividus (A-E) and Marthasterias glacialis (F-J) with different bathing solutions. Values are means + S.D. for 10 tube feet from one of three animals, each animal being indicated by a different colour. Data analysed using a two-way ANOVA; means sharing at least one letter are not significantly different (PTukey≥0.05). See text for abbreviations.