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(a) Schematic of the optical module in the prototype. 1. CCD camera, 2. Fluorescence filter container, 3. Sensors for filter rotation, 4. Dichroic mirror, 5. 10× objective lens, 6. 530 nm LED, 7. Sample cartridge, 8. DC motor. (b,c) Complete prototype of the Helios CD4 Analyzer.
