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Cytoplasm of maturing amphibian oocytes possesses a factor that induces germinal vesicle breakdown. This factor was extracted from Rana pipiens eggs and assayed by microinjection in Xenopus laevis oocytes. The activity of this factor is Mg-dependent, Ca-sensitive, and associated with heat-labile protein. Centrifugation on a sucrose density gradient revealed that the factor exists in three different molecular sizes.
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Yoshio Masui (1976) studied this question.
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