A microarray scanning system for conducting experiments on a planar substrate includes an apparatus for translating the secured substrate in two axes, the substrate having at least one fiducial mark on the planar substrate as a means for positioning and aligning the substrate for subsequent spot placement,...http://www.google.de/patents/US6362004?utm_source=gb-gplus-sharePatent US6362004 - Apparatus and method for using fiducial marks on a microarray substrate
