Abstract
The result of an electron microscope autoradiographic study following a pulse labelling is consistent with the interpretation that in the salivary gland cells of late larval stage of Smittia, the synthesis of nucleolar RNA is primed by the intranucleolar DNA dispersed in the inner part of the nucleolus. From the limited evidence so far available, it is postulated that the nucleolar organizer complex may consist of an internal and an external entity. Such a distinction finds support in what appears to be a functional divisibility of the organizer. These postulates await confirmation.
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