Hydra: Induction of Supernumerary Heads by Isolated Neurosecretory Granules

See allHide authors and affiliations

Science  29 Oct 1965:
Vol. 150, Issue 3696, pp. 633-635
DOI: 10.1126/science.150.3696.633


Neurosecretory granules of Hydra littoralis were isolated by differential centrifugation. Excised midsegments of hydra that were exposed to the fraction containing neurosecretory granules developed additional heads at any site, as they regenerated. Hence neurosecretory granules may contain a factot that regulates or stimulates growth in normal and regenerating hydra.