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(A-E) Photograph of the tumor taken before and after PDT with an injection of AuNC-HPPH at various time points up to 9 days. PA images acquired (F) before intratumoral injection of AuNC-HPPH, (G) after injection, and (H-J) 3, 7, and 9 days post-treatment. (K-O) Depth-resolved PA B-scan images cut along the dotted lines in (F-J), respectively. (P-T) Depth-encoded PA images of (F-J), respectively. BV, blood vessels; T, Tumor boundary; and N, tumor necrotic region.
