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. 2010 Mar 3;98(5):824–833. doi: 10.1016/j.bpj.2009.10.054

Figure 3.

Figure 3

Relative positions along the chromatin fiber. The polymerase moves to the right, X(t) being its position at time t. The value l0 is the length of the loop region downstream of the initiation site X(0) = 0, and l(t) = l0 – X(t) is the length remaining at time t between the polymerase and the downstream boundary.