... lM) as indicated. Cytoplasmic lysates were assayed for GFP-MKK62Eprotein by Western blot,and for activation of the p38 MAP kinase/MK2 pathway by in vitro kinase assays with recombinant HSP27 ... plasmid for puromycin resistance, and stable transfectants selectedby culture in 1 lgÆmL)1puromycin. Myc-tagged HuRwas expressed with the plasmid pTet-Myc-over-HuR [27](a gift from A B. Shyu, ... kindly donated by H. Furneaux, University ofConneticut Health Center, Farmington, CT, USA, andG. Dreyfuss, University of Pennsylvania School ofMedicine, Philadelphia, PA, USA, respectively.Transfections...