Fig. 3.

(A) Absorption spectra of common endogenous chromophores in biological tissues. Reprinted with permission from [36] (B) photoacoustic images acquired from mouse small intestine cells and DNA contrast at 266 nm. Reprinted with permission from [79], fibroblast cytoplasm’s with cytochrome contrast at 422 nm, reprinted with permission from [80], PA image of mouse blood smear with hemoglobin contrast at 532 nm, reprinted with permission from [81], tyrosinase tumor expressing with melanin contrast at 680 nm, reprinted with permission from [12], photoacoustic image of mouse paw with skin removed and collagen contrast at 780 nm, reprinted with permission from [82], intramuscular fat photoacoustic image with lipid contrast at 1197 nm, reprinted with permission from [83].