Measurements of the sodium content of single oocyte nuclei of Triturus cristatus carnifex at various stages of maturation, show a rise in concentration in eggs of the size 0·5–0·6 mm diameter. When the nuclei are isolated rapidly under paraffin, the absolute values obtained for the concentration are much lower than have been previously reported for this species.
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Muir et al. (1972) studied this question.
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