Competition between HMG1 and H1 for cis-DDP-modified 34-bp fragment. Lanes C and C1 contain the unmodified 34-bp DNA and the cis-DDP-modified 34-bp DNA, respectively. The successive lanes contain the HMG1/cis-DDP-modified 34-bp complex with a molar ratio of H1 to HMG1 of 0, 0.06, 0.3, 0.6, and 1.2.