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A cartoon illustrating most representative examples of SN chromatin configurations: (a) conspicuous nucleolus-like body (NLB) is rimmed by condensed chromatin forming a karyosphere, but some heterochromatin blocks are also located outside; (b) all the chromatin is assembled into a rather compact karyosphere around large NLB; and (c) configuration similar to (b), but NLBs are not so prominent. Designed according to Figure 1c and data from [20,21,22,27].
