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Yeast nucleus is approximated by a sphere of radius 1 μm. Center of the sphere (marked by a cross) is at (1000,1000,1000) in units of nanometers in the model coordinate. Nucleolus is represented by the region of z > z0. One of 16 chromosomes (Chr10) is schematically drawn in the figure. Centromere of each chromosome is linked to spindle pole body (SPB), which is a protein complex embedded in the nuclear envelope, and termini of each chromosome are left and right telomeres.
