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Schematic representation of a fluorescent oligomer, in this case a pentamer that comprises two donors (D, green) and three acceptors (A, yellow). The various arrows indicate possible pathways for energy loss or transfer from donors to acceptors. (Solid arrows) FRET (ΓFRET); (dashed arrows) nonradiative loss (Γnr,D); and (wavy arrows) radiative loss (Γr,D). To see this figure in color, go online.
