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Fig. 3. Representative relaxation responses of (A) a tube foot or (B) apical muscle to treatment with 10 µmol l-1 SNAP (S-nitroso-N-acetylpenicillamine), 10 µmol l-1 S1 or 10 µmol l-1 S2 from one of six preparations tested (see Fig. 4 for a graphical representation of data from all six preparations).