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Extension versus supercoiling for a single DNA-RecA-ATP fiber. (A) Medium forces are: 8 pN (×), 4 pN (□), 2 pN (+), 1 pN (○). (B) Low forces are: 0.8 pN (×), 0.4 pN (□), 0.2 pN (+), 0.1 pN (○). The continuous curve represents the reference for naked DNA at 0.3 pN.
