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In vivo noninvasive PA images of the SLN in a rat. (A) Photograph with hair removed before PA imaging. (B) Photograph with skin removed after PA imaging. (C) Control image before the MB injection. (D) PA image immediately after the injection. (E) 52 min post-injection PA image with the scan head repositioned. (F) PA image of the deeply positioned (~ 18 mm) SLN. (Reprinted with permission from ref 65. Copyright 2008 Society of Photo-Optical Instrumentation Engineers.)
