19.2 The AXis of symmetry nucleosome Protein =3.2 nm is the subunit Radius of gyration of all DNA=5.2nm chromatin Figure 19.5 The two turns of dna on the nucleosome 2 turns of dNA, each 2 nm diameter lie close together occupy most of height(6 nm) 消当Figure 19.5 The two turns of DNA on the nucleosome lie close together. 19.2 The nucleosome is the subunit of all chromatin