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. 2011 Jan 31;6(1):e16536. doi: 10.1371/journal.pone.0016536

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Björkelund et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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(A) 1∶1 and (B) 1∶2 interaction models (black) fitted to titration data of ¹²⁵I-EGF binding to A431(green) and U343 (red) cultured cells. The deviations of the fitted models from the data are described in residual plots for the (C) 1∶1 and (D) 1∶2 interaction models. The 1∶1 interaction model fits the data poorly.