Summary
Secretin-like cells have been detected in the digestive tract of the ascidian Styela plicata by means of immunofluorescent and immunocytochemical methods.
Especially, in the esophageal epithelium there are immunoreactive cells (S2) in which a biogenic amine (5-HT) and a regulatory peptide (secretin) occur together. In the gastric epithelium only secretin-like cells (S1) are present.
Tests of cross-reactivity performed with glucagon, GIF and VIP, have confirmed the presence of a secretin-like molecule only in the S1 and S2 cells.
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References
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Pestarino, M. Occurrence of different secretin-like cells in the digestive tract of the ascidian Styela plicata (Urochordata, Ascidiacea). Cell Tissue Res. 226, 231–235 (1982). https://doi.org/10.1007/BF00217097
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DOI: https://doi.org/10.1007/BF00217097