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[文献書誌] O.Koizumi,H.Mizumoto,T.Sugiyama & H.R.Bode: "Nerve net formation in the primitive nervous system of hydraーAn overview" Neuroscience Research. Suppl.13. 165-170 (1990)
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[文献書誌] O.Koizumi &H.R.Bode: "Plasticity in the nervous system of adult hydra III.Conversion of neurons to expression of a vasopressinーlike immunoreactivity depends on axial location." Journal of Neurasciences. 11. 2011-2020 (1991)
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[文献書誌] 小泉 修,美濃部 純子: "ヒドラの原始的な神経系と神経ペプチド" 脳 腸ホルモン学会ニュ-ス. 6. 1-5 (1991)
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[文献書誌] C.J.P.Grimnelikhuijzen,D.Graff,O.Koizumi,J.A.Westtall,I.D.McFarlane: "Neuropeptides in coeEnterates:A review" Hydrobiologia. 216/217. 555-563 (1991)
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[文献書誌] O.Koizumi & S.Minobe: "Important role of epithelizel cells in the formation and maintenaze of nerve net in the primitive nervous system of hydra" “Molecular Basis of Neural Connection". (1992)
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[文献書誌] O.Koizumi,M.Itazawa,H.Mizumoto,S.Minobe,L.Z.Javois,G.C.J.P.Grimmelikhuijze & H.R.Bode: "The nerve ring of the hypostone in hydra:I.Its structure,Development and Maintenance" Journal of Comparative Neurology. (1992)
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[文献書誌] C.J.P.Grimmelikhuijzen,D.Grafハ,O.Koizumi & I.D.MacFarlane: "Evolution of the first nervous systems" Plenur Press,New York, 423 (1990)