Correction

Meredith Newby Lambert, Eva Vöcker, Seth Blumberg, Stefanie Redemann, Arivalagan Gajraj, Jens-Christian Meiners, and Nils G. Walter. 2006. Mg²⁺-induced compaction of single RNA molecules monitored by tethered particle microscopy. Biophys. J. 90:3672–3685.

Equation 1 of the original article should read:

$$\frac{N_i}{N}=\frac{\exp \left(-E_i/k_{B}T\right)}{\sum _j\exp \left(-E_j/k_{B}T\right)}.$$