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Abstract
Moens and colleagues express concern that our report of phosphorylation of p38–regulated/activated protein kinase (PRAK) at Ser93 in senescent cells may be incorrect as a result of their inability to detect phosphorylated PRAK with the same antibody. We provide additional characterization of the antibody that we used and show that there is a 42-kilodalton phosphoprotein detected by this antibody, but that this phosphoprotein may not be PRAK.
