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A phosphorylated protein with molecular mass of 25,000 (pp25) can be derived from Xenopus laevis vitellogenin B1. In order to clarify the distribution of pp25, the changes in the concentration and localization of this protein in oocytes and embryos were examined by immunoblotting and immunohistochemistry using anti-pp25 antibodies, and compared with those of yolk proteins. In oocytes, pp25 was shown...
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