Abstract
In the starfish Pisaster ochraceous, light microscopical histochemical analysis shows that the cells previously proposed as the source of starfish insulin are mucous cells secreting acid mucopolysaccharides into the pyloric lumen. No cellular or subcellular entity in the pyloric ceca satisfies the common staining criteria for β-cells, and the cytological source of starfish insulin is probably not demonstrable by conventional insulin stains. It is suggested that differentiated β-cells and granules may not occur in invertebrates and may be unique to the highly differentiated tissue systems of vcrtebrates. Evidence is presented that the paraldehyde fuchsin and pseudoisocyanin tests currently in common use for insulin detection are insufficiently trustworthy for use in diagnostic research on invertebrate or other inadequately analyzed tissues.
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