Photodynamics Research Center, The Institute of Physical and Chemical Research (RIKEN), 19-1399 Koeji, Nagamachi, Aoba, Sendai 980, Japan
(Received May 11, 1993; Accepted June 25, 1993)
Keywords: regeneration, Hydra, cell aggregates, regeneration polarity, patterning
Abstract. Hydra can regenerate complete animals from a random collection of dissociated cells, a cell aggregate. In such regeneration, a new pattern of the head and foot will arise anew because the original pattern and the polarity for regeneration have been completely destroyed. A possible mechanism of such de novo patterning in cell aggregates is discussed.