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(a and b) Electron micrographs showing the association of helical filaments and large rings (arrows), after β protein was incubated with MgCl2 and heat-denatured 1,264-base φX174 fragment. (c) Filaments originating from large rings when partially duplex φX174 DNA was incubated with β and MgCl2. (Scale bar for a and c = 1000 Å. The magnification of b is 2× that of a and c.)
