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Background: Protein kinase, interferon-inducible double stranded RNA dependent activator (PACT, PRKRA) is a proapoptotic cellular protein activator of PKR, a double-stranded RNA-dependent protein kinase (1). PACT is reported to be stress-activated, and a physiologic activator that couples transmembrane stress signals and protein synthesis (2). Overexpression of PACT in cells causes enhanced sensitivity to stress-induced apoptosis. It is expressed at high levels in colonic epithelial cells, especially as they exit the cell cycle and enter an apoptotic program (3).