Abstract
Biotin and/or 125I-labelled histone H1 proteins (21 kd) have been covalently bound to single-stranded DNA. Complexes of equal masses of DNA and modified histone H1 (approximately 1 histone H1 molecule per 70 nucleotides) were used as probes for blot hybridization experiments and found to have hybridization characteristics very similar (or identical) to radiolabelled DNA probes.