Figure 4From: Negative auto-regulation increases the input dynamic-range of the arabinose system of Escherichia coliThe promoter activity of araC increases with arabinose. Shown is araC promoter activity as a function of arabinose concentration, in the wild-type strain (with NAR, green circles). The dashed green line is a fitted Hill functions with n = 1 ± 0.6, K = 0.6 ± 0.4M (s.e.). The solid purple line is the best fit of the full model described in Additional File 1.Back to article page