B: Signalling input conditions (left side shows deduced input function, right side shows pERK2 measurements): Sustained ERK signalling (4OHT), two-hour pulse ERK signalling (4OHT+U0126), growth factor signalling (EGF: Epidermal growth factor, FGF: Fibroblast growth factor). Deduced input functions: 100% signalling amplitude corresponds to mean induction in training condition (4OHT). Growth factor-induced input functions are linear interpolations of pERK2 log2 fold changes relative to mean induction in test condition. 