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Autoradiograph of nuclei from the ovary of the toad Xenopus after in situ hybridization with 3H-labeled ribosomal RNA. The most heavily labeled nucleus is in the pachytene stage of meiosis, when the amount of amplified rDNA reaches its maximum. The two largest round nuclei are from oogonia. They show a low level of rDNA amplification compared with the essentially unlabeled diploid follicle nuclei and dense red blood cell nuclei at lower right.
