The Biosynthesis of Apoferritin by Reticulocytes

MATIOLI AND EYLAR PROC.N. A. S.(Fig. 2A), the pH 9.2 RNA is the only nonribosomnal, acid-insoluble RNA syn- thesized in the lampbrush nucleus that we have been able to detect.Summary.-The RNA synthesized in lampbrush-stage o6cytes of Xenopus laevis has been extracted and characterized.Most of the RNA present in the mature oocyte is synthesized in the lampbrush stage, and over 90 per cent of this is ribosomal RNA.We are greatly indebted to Mrs. Judith Ann de Graaff for her expert and conscientious