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The nuclei of growing mouse oocytes, demonstrating different chromatin organization as viewed after DAPI staining: (a) NSN; (b) early SN; a heterochromatin “ring” around unstained nucleolus-like body appears; and (c) late SN; chromatin is assembled in a more compact mass (karyosphere). Asterisks indicate nucleolus-like bodies. Scale bars represent 20 μm.
