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Top: Multiphoton-induced emission spectra of Tb with wild-type TnC (200 μM). Middle: Multiphoton-induced emission spectra of Tb with TnC mutant 26W (100 μM), 5 mM HEPES, 50 mM NaCl. Bottom: Dependence of the emission intensity at 550 nm on the incident laser power at 794 nm.
