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Gold nanoparticles, with their unique optical property, can be used as biosensors within living cells. They emit bright resonance lights of different wavelengths and colors depending on their size, shape, degree of aggregation, and the nature of the organic shells protecting them. Due to this property, gold particles have been widely used as probes in the sensing/imaging of a variety of targets/analysts. Alpha Lifetech Inc. provides high-quality gold nanoparticles that meet high standards of purity, stability, and functionality.