the circular dichroism properties of the unperturbed mononucleosome preparations and the corresponding h1- and h5-depleted species demonstrate that the nucleoprotein spectra above 250 nm are all altered relative to protein-free dna by the addition of a single negative band at 275 nm , similar to the band observed for psi-dna .
C0028612
nucleoprotein
C0033684
protein