A fine structural study of regeneration after fission in the planarian Dugesia japonica |
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Authors: | Hori Isao Kishida Yoshikazu |
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Institution: | (1) 1Department of Biology, Kanazawa Medical University, Uchinada, Ishikawa 920-0293, Japan;(2) 2Okayama Prefecture, 709–0827, Japan. |
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Abstract: | We examined morphologically the process of regeneration before and after fission in a sexual strain of the freshwater planarian
Dugesia japonica. Usually fission takes place in the post-pharyngeal region. Decapitation significantly accelerates the rate
of fissioning. When decapitated worms were treated with substance P and neuropeptide K separately, the rate of fission markedly
decreased in both cases. Before the onset of fission, a presumptive region of fission was recognized in the post-pharyngeal
portion where undifferentiated cells, regenerative cells and newly differentiated cells were localized. Moreover a functional
network of fixed parenchyma cells was noted in this region. After fission, cell distribution in the blastema became quite
different from that of artificially amputated worms. This difference seems to be due to the process that occurs in the presumptive
region of fission.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | Fission neuropeptide planaria platyhelminthes regeneration |
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