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Abstract
Marasa et al. (Research Article, 27 October 2009, DOI: 10.1126/scisignal.2000442) reported that the human kinase p38–regulated/activated protein kinase (PRAK) was phosphorylated on residue Ser93 in senescent cells. We have been unable to detect phosphorylation at this site with the antibody that they used, and the commercial supplier of this antibody has discontinued its availability, which casts doubt on whether this residue of PRAK is phosphorylated.
