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Typical force-extension curves of a heterogeneous (X)30, a repetitive (GT)15, and a (GTT)10 sequence. In contrast to the force-extension curve of the heterogeneous DNA sequence, which follows the two-state FJC behavior, the repetitive DNA duplexes elongate at a force (slipping threshold) of ∼35–40 pN until they finally dissociate (rupture force).
