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Wilehm Roux Arch Dev Biol
1978 Jun 01;1842:171-180. doi: 10.1007/BF00848225.
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Electrophoretic spectra of nuclear proteins from embryos ofXenopus laevis.
Holoubek V, Tiedemann H.
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The changes in saline-soluble, 0.35 M NaCl-soluble and the residual fraction of nuclear proteins during early development ofXenopus were studied by analytical electrophoresis on sodium dodecyl sulfate polyacrylamide gel. The fractions were obtained by consecutive extraction of nuclei from the blastula, neurula and tail-bud stage of development. No qualitative and only limited quantitative differences were found when the proteins of any of the three fractions isolated from the neurula stage were compared with the proteins of the corresponding fraction isolated from the tail-bud stage. But the electrophoretic pattern of each of the three fractions of the nuclear proteins from the blastula stage differs significantly from the electrophoretic pattern of the same fraction isolated from the neurula or tail-bud stage. Compared with the blastula stage, in the two later stages the relative amounts of chromosomal proteins with apparent molecular weights below 30,000 are decreased. Proteins which migrate in electrophoresis in the positions of the very lysine-rich histones and of the proteins of the nuclear ribonucleo-protein particles are indicated among the chromosomal proteins of the blastula stage, and are visible as strong bands in the electrophorogram of 0.35 M NaCl-soluble proteins extracted from neurula or tail-bud stage nuclei.
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