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(a) Photograph of a collagen patch sample for PAI. (b) Corresponding PA MAP image. (c) 3-D PA image of the collagen patch (Video 1). FOV, field of view. The inserted scale bar is 1 mm. (Video 1, 5.74 MB, MP4 [URL: https://doi.org/10.1117/1.JBO.25.5.056002.1].)
