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We screened a library of human single-transmembrane proteins (sTMPs), produced by a cell-free system, using a luminescent assay to identify those that can be cleaved by caspase-8 (CASP8). Of the 407 sTMPs screened, only the interleukin-21 receptor (IL21R), vezatin (VEZT), and carbonic anhydrase XIV were cleaved at Asp344, Asp655 and Asp53, respectively. We confirmed that IL21R and VEZT were also cleaved...