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Label-free photoacoustic ophthalmic angiography of the iris microvasculature of a living adult Swiss Webster mouse. (a) The maximum amplitude projection image acquired at 570 nm (volumetric visualization is available online as Media 1). (b) A close-up of the boxed area in panel a. The yellow arrows indicate individual red blood cells (RBC) in iris capillaries. (c) The profile of an RBC crossed by the red dashed line in panel b. LIC: lesser iris circle. PA: photoacoustic signal.
