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Label-free OR-PAM of fixed but unstained fibroblasts at (A) 422 nm and (B) 250 nm. (C) A superimposed image of panels A and B. (D) Fluorescence microscopy of the same sample with mitochondria and nuclei stained in different colors. Scale bar in panel A is 20 μm and applies to all panels. PA, photoacoustic. Reproduced from Zhang et al. (34).
