"Using recombinant proteins this study investigated the influence of survivin on the inhibition of caspase-9 by XIAP in vitro. With a fluorescence-based assay for the apoptosome-stimulated activity of caspase-9 the study shows that survivin has no effect on the inhibition of caspase-9 by XIAP neither in the presence nor in the absence of Smac."xsd:string