Abstract
The relative positions of nucleoli and the Y-chromatin body were investigated in human interphase fibroblast nuclei to determine if the reported nucleolar association of the Y-body might be a chance phenomenon. Although nucleolar material was found to be mainly in the central area of the nucleus, the association of the Y-body with a nucleolus was highly significant, irrespective of the morphology or location of the Y-body within the nucleus. The association was corroborated with late interphase and early prophase nuclei in which nucleolar remnants were seen to concentrate around the Y chromosome.
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