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Abstract
Cells of different areas of amphibian embryos from blastula to early neurula stages were separated by density gradient centrifugation and their electrophoretic mobility (EPM) was measured. Differences in EPM were present between cells derived from different areas of the embryo. Cells of the marginal zone show the greatest increase in mobility between early and midgastrula. Vegetal pole cells had lower mobilities when compared with cells of other embryonic regions. Differences in EPM were found between stages. Early gastrula cells had the lowest mobility of any stage while those at midgastrula attained the highest values. Marginal zone cells showed the greatest increase in mobility between early and mid gastrula.
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