symmetry considerations of the kind of structures which can be generated when dimers of histones f2al-f3 and f2a2-f2b interact lead to the following conclusions : chromatin subunits based on closed-shell structures give rise to discrete , non-interacting nucleoprotein subunits with the histones arranged at random along the dna chain ;
C0008546
chromatin
C0028612
nucleoprotein