Tyrosine isomers and hormonal signaling: A possible role for the hydroxyl free radical in insulin resistance

Figure 8 Densitometric analyses of the phosphorylation of signal transducer and activator of transcription 5 (A: n = 3); densitometric analysis of extracellular signal regulated kinase 1 (B: n = 4) and extracellular signal regulated kinase 2 (C: n = 4). The data are expressed as the percent of untreated (control) cells. ^aP < 0.05; erythropoietin (EPO) vs control (one-sample t-test); ^cP < 0.05 vs para EPO (one-way ANOVA). Republished with permission of S Karger AG, basel from Mikolás et al[21].