DNA, DEOXYRIBONUCLEIC ACID, CISPLATIN, DUPLEX, DODECAMER, HMG-DOMAIN INTERACTION 1A84 NMR SOLUTION STRUCTURE OF A DNA DODECAMER DUPLEX CONTAINING A CIS- DIAMMINEPLATINUM(II) D(GPG) INTRASTRAND CROSS-LINK, THE MAJOR ADDUCT OF THE ANTICANCER DRUG CISPLATIN, 1 STRUCTURE