Nucleolus Xenopus

Fig. 5. In situ hybridization of radioactive rRNA with cytological preparations from the ovary of Xenopus laevis. (A) Oogonial stages with a few silver grains located over the centrally placed nucleolus (arrow). X 1275. (B) Two nuclei from leptotene stage oocytes showing a few silver grains over the eccentrically placed nucleoli (arrows). X 1275. (C) Three small unlabeled follicle nuclei and three larger heavily labeled nuclei from pachytene stage oocytes. X1020. [By courtesy of Dr. J. G. Gall, reprinted from Proc. Nat. Acad. Set. 17.S. 63, 378 (1969).]...

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