light treatment of nuclei of physarum polycephalum microplasmodia with dnase i , at low mgcl2 concentration ( less than or equal to 3 % dna acid solubility , 0.1 mm mgcl2 ) selectively solubilizes a defined fraction of chromatin , in the form of a macromolecular complex .
C0007610
nuclei
C0008546
chromatin