A porous catalyst layer formed from discrete particles of unsupported metal, wherein at least 80%, suitably at least 90%, of the discrete particles have a mass of from 1 to 1000 zeptograms, and wherein the catalyst layer has a metal volume fraction of less than 30% and a metal loading of less than 0. The coating enables simplified manufacturing of a thermal sublimation dye transfer donor of high quality. Methods of interfering with SDF-1 andor I-TAC binding to the CCXCKR2 receptor and treating cancer using the compounds and pharmaceutical compositions of the present invention are also disclosed. The vacuum cleaner can further comprise a diverter assembly for switching between dry and wet mode cleaning, where the diverter assembly forms an inlet to the recovery tank. The tubular body is compressed between the workpiece and bushing as the bushing is displaced radially causing corresponding radial displacement of the tubular body. A user interface is configured to use input from the stylus and touch sensor to modify content presented on the reflective display.