Raikova E V
J Embryol Exp Morphol. 1976 Jun;35(3):667-87.
Evolution of the nucleoli has been followed during oogenesis in the Acipenserid fishes, Acipenser ruthenus (the sterlet) and A. guidenstadti (the sturgeon) using light and electron microscopes. In the ovaries of adults, the oogonial nuclei usually have a single nucleolus with an adjacent mass of paranucleolar fibrillar material. The cytoplasm of the oogonia contains two dense bodies peculiar only to gonocytes, one being electron dense and containing RNA and the otherbeing electron-lucent and lacking RNA...
利用光学显微镜和电子显微镜，对鲟科鱼类俄罗斯鲟（小体鲟）和施氏鲟卵子发生过程中核仁的演化进行了追踪研究。在成年鱼的卵巢中，卵原细胞核通常有一个核仁，旁边有一团核仁旁纤维状物质。卵原细胞的细胞质中有两个仅存在于生殖细胞中的致密小体，一个电子密度高且含有RNA，另一个电子密度低且不含RNA……
