Dedicated binding proteins stabilize single-stranded DNA, protecting it from breakage and distortion. Once thought to form inert complexes with DNA, such proteins are now shown to be remarkably mobile. The cell's genetic information is maintained as a double helix of interwoven DNA strands in which the information content (the nucleotide sequence) is tucked away between sheltering sugar–phosphate backbones. Although this stable structure benefits long-term information storage, the two strands of DNA must be unwound to allow DNA replication, genetic recombination and repair.