Archive image from page 36 of Cytology, with special reference to. Cytology, with special reference to the metazoan nucleus cytologywithspec00agar_0 Year: 1920 V., Fig. 10. Prochromosomes in Pollen Mother cells of Calycanthus fioridus. (Overton, , 1906.) A, resting nucleus ; B, prophase. 1 The fibres cannot always be traced actually into the centrosome, but sometimes end in a clear spherical mass of cytoplasm, called the centrosphere, surrounding the centrosome.

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