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The University of Southern California of Los Angeles has received US Patent No. 7,824,630, "DNA probe synthesis on chip on demand by MEMS ejector array." The patent claims a method of aligning a target chip containing DNA probe sites with an array that contains groups of ejectors. According to the patent, each group of ejectors is coupled to a corresponding reservoir containing a DNA base material, and each ejector includes a self-focusing acoustic transducer that can focus waves using constructive interference to eject DNA base materials onto the DNA probe sites.

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