Data sets DATA*_hall: time (phosphorylated STAT5 in cytoplasma) SD (total STAT5 in cytoplama) SD Data sets DATA*_hall_inp: time (Activation of Epo-Receptor) Data sets 1, 4, 13 were used for parameter estimation Data set 2 was used for validation, see Supplementary Information In the case of questions, please contact Jens Timmer: jeti@fdm.uni-freiburg.de