... a neurophysin domain but which encode neuropeptides that are structurally unrelated. Furthermore, both NGFFFamide and echinotocin cause contraction of tube foot and oesophagus preparations from the sea urchin Echinus esculentus , consistent with the myoactivity of NGIWYamide in sea cucumbers and the myoactivity...

.... Our aim here was to characterise SALMFamide neuropeptides in sea urchins (class Echinoidea). Radioimmunoassays for the starfish SALMFamides S1 and S2 were used to test for related peptides in whole-body acetone extracts of the sea urchin Echinus esculentus . Fractionation of extracts using high...

...D. M. Woolley; G. G. Vernon ABSTRACT When the spermatozoon of Echinus esculentus swims in sea water containing methyl cellulose (viscosity 1.5–4 Pa s), its flagellum may generate either a helical or a planar waveform, each type being stable. The helical wave, which is dextral, is complicated...