Fig. 7. Sequences from the q arms of human acrocentric chromosomes co-purify with hybrid cell nucleoli. Nucleoli purified from A9HyTK-13, 14, 15, 21, 22 and X were probed with paints derived from the q arms of HSA13, 14, 15, 21 and 22, and the p and q arms of HSAX, respectively (green). Nucleoli were stained with DAPI (blue). The identity of each nucleolus is shown in the top left corner of each panel. The scale bar represents 1 µm.