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Extracellular Electrical Currents in the Chick Blastoderm

Pavel Kučera and Yves de Ribaupierre
Biological Bulletin
Vol. 176, Supplement: Ionic Currents in Development (Apr., 1989), pp. 118-122
DOI: 10.2307/1541659
Stable URL: http://www.jstor.org/stable/1541659
Page Count: 5
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Extracellular Electrical Currents in the Chick Blastoderm
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Abstract

Extracellular electrical currents were recorded using a computer-controlled scanning vibrating electrode from gastrulating chick blastoderms cultured in vitro. On the ventral surface, currents of 10-20 μ A/ cm2 diverged from the area opaca and turned around the margin of blastoderm across the vitelline membrane. Weaker currents (1-10 μ A/ cm2) converged to the anterolateral area pellucida and penetrated it in the ventrodorsal direction. On the dorsal surface, currents returned to the area opaca from the margin and from the center of area pellucida. During development, the pattern of currents remained similar on the dorsal surface while the leaky area on the ventral surface progressively extended to all the periphery of area pellucida. The intensity of currents in the blastoderm oscillated with a period of 5 to 6 min. This spatio-temporal organization of extracellular currents is compared to physiological activities of embryonic cells in different regions of the blastoderm.

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