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On the Minimal Size of a Planarian Capable of Regeneration

J. R. Montgomery and S. J. Coward
Transactions of the American Microscopical Society
Vol. 93, No. 3 (Jul., 1974), pp. 386-391
Published by: Wiley on behalf of American Microscopical Society
DOI: 10.2307/3225439
Stable URL: http://www.jstor.org/stable/3225439
Page Count: 6
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On the Minimal Size of a Planarian Capable of Regeneration
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Abstract

By the use of a simple nutrient medium containing only amino acids, glucose, and inorganic salts, complete cephalic regeneration has been obtained from fragments of the planarian Dugesia dorotocephala as small as 0.08 mm3. It is calculated that this volume is equivalent to 1 x 104 cells. This number is very close to the minimal number of cells required for regeneration of Hydra and probably is a reflection of the minimal number of units or volume necessary to establish morphogenetic heterogeneities.

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