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Stained lymphocytes: optical (A and E), ultrasound (B and F), photoacoustic at 532 nm (C and G) and photoacoustic at 600 nm (D and H) images of lymphocytes. The arrows indicate areas of fine like structure (C and G) and voids in the signal (H) that are not observed in the optical image. The scale bar is 5 μm.
