STAT3 and systemic lupus erythematosus: Increased phosphorylation of STAT5 and STAT3 have been reported in B cells of the congenic B6.Sle1abz and B6Sle1z.Sle3z lupus mice [21], [22], and Harada et al.[23] have demonstrated increased STAT3 mRNA levels in T cells from SLE patients, associated with enhanced chemokine-induced cell migration.