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. 2016 Apr 14;6:24344. doi: 10.1038/srep24344

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(a) The energy diagram of the eGFP. Four-wave mixing process on the excited vibronic states (S_n, S₁) and the ground state (S₀) of the eGFP. (b) A pump-probe configuration setup for measuring the conversion efficiency of four-wave mixing process. Inset: the locations of fluorescence peak of each sample and the signal filter. P556(pyrromethene 556), P546(pyrromethene 546).