【正文】
cular rDNA arrangements (arrows). The DNA ponents within the FC remain in an aggregated states. Profile of the arrangement of rDNA in the nucleolus. Micrographs of rDNA arrangement at high magnifications. (A,B) DNA clumps within FCs are connected with rDNA surrounding the FC by DNA fibers (white arrows). A and B are partial enlargements of C. rDNA ultrastructures after specific staining, showing the variation in thickness of rDNA fibers (A). The distribution of AgNOR protein in the nucleolus. (A) AgNOR proteins are mainly distributed in the interior of the nucleolus and present as circular configurations with hollow centers. The similarity between rDNA and AgNOR arrange