Demonstration by immunocytochemical staining of a somatostatin-28-(1-14)-like peptide in planarians (Plathyhelminthes Turbellaria Tricladida).

A specific polyclonal antiserum directed against the somatostatin-28(1-14) of vertebrates was applied to sections of the planarians Dugesia lugubris and Dendrocoelum lacteum. This made it possible to reveal nerve cells and processes specifically both in cerebral ganglia and in ventral nerve cords. The phylogenetic importance of this demonstration is pointed out.