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(A) Molecular structures, normalized absorption and emission of BOB. (B) Confocal of difference type of cells (cos-7 cells a1–a3, RAW 264.7 cells b1–b3, HeLa cells c1–c3, HepG2 cells d1–d3, and MCF-7 cells e1–e3) incubated with BOB and the ratio images. Green channel pictures: a–e; Red channel pictures: a1–e1; DIC pictures: a2–e2; Ratio pictures: a3–e3. Reproduced from [100] with permission of the Wiley, copyright 2015.
