This experiment compared the activity of recombinant human furin with and without exposure to xenon gas, using a microplate assay. The measured enzyme activity for the control and test samples is presented in Figure . For clarity, the 4 upper lines in the graph which rise and curve downward over the 24 hour period of measurement, represent the activity of furin in the control wells, which were not exposed to xenon. The bottom 4 flat lines, which overlap one another at the bottom of the graph, represent the minimal enzyme activity after inhibition by xenon gas.