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(Color online) In vitro imaging of a Congo-red-stained brain section from a 10-month-old APP/PS1 mouse. (A) The entire hippocampus imaged using conventional fluorescence microscopy. (B) A region of interest selected from (A) (boxed area). (C) The same region of interest imaged by optical-sresolution photoacoustic microscopy for comparison. Arrows: plaques. Scale bar in (A) applies for (A–C).
