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(A) PAFC of RBCs in different vessels [20]. (B) PA flowoxigraphy of oxygen metabolism [88]. (C) Scheme of FRET PAM [29]. (D) Optical-resolution PAE [35]. Abbreviations: PAFC (photoacoustic flow cytometry); RBCs (red blood cells); FRET (Förster resonance energy transfer); PAE (photoacoustic endoscopy).
