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(A) In vivo noninvasive PA image of subcutaneous blood vessels in a rat using microscopic PACT with a linear ultrasound array. The regions enclosed by major blood vessels are labeled using A–E. (B) Photograph taken from the dermal side of the excised skin with transmission illumination. (Reprinted with permission from ref 23. Copyright 2008 Society of Photo-Optical Instrumentation Engineers.)
