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Abstract Evidence is presented that nitric oxide (NO) may regulate blood pressure in cephalopod molluscs. Invitro tests performed on the cephalic aorta of Sepia officinalis (L.) (Cephalopoda) showed that the NO releasers (glyceroltrinitrate, sodium nitroprusside, 3-morpholinylsydnoneimine chloride and KNO2) induced concentration-dependent vasodilatation of vessel segments (without the tunica adventitia/periadventitia)...