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Fig. 4. Graphs comparing the mean relaxation responses (± S.E.M.) of cardiac stomach (N=5), tube foot (N=6) and apical muscle (N=6) preparations to 10 µmol l-1 SNAP (S-nitroso-N-acetylpenicillamine), 10 µmol l-1 S1 and 10 µmol l-1 S2, expressed as a percentage of the responses to SNAP.