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Exemplary UPS library consisting of 10 nanoprobes spanning a wide pH range (4–7.4) and large fluorescent emissions (400–820 nm). Each nanoprobe is encoded by its transition pH and fluorophore. Images of 4.4-AMCA and 4.7-MB were taken by a camera at an excitation light of 365 nm. Images of the rest of the nanoprobe solutions were taken on a Maestro Imaging system.
