chicken histone h4 , labeled separately at met-84 with n- [ [ ( iodoacetyl ) amino ] ethyl ] -5-naphthylamine-1-sulfonic acid and 5- ( iodoacetamido ) fluorescein , was reassociated with unlabeled histones h2a , h2b , and h3 and 146 base pairs of dna to produce fluorescently labeled nucleosomes having physical characteristics virtually the same as those of native core particles .
C0019646
histones h2a
C0028623
nucleosomes