radioimmunoassays that detect pyrimidine-pyrimidone ( 6-4 ) photoproducts and cyclobutane dimers were used to determine the relative induction of these photoproducts in nucleosomal ( core ) and internucleosomal ( linker ) dna in human cell chromatin irradiated with uv light .
C0028623
nucleosomal
C0008546
chromatin