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. 2014 Dec 1;118(50):14627–14631. doi: 10.1021/jp511126x

Figure 2.

Figure 2

Excitation power dependence of (a) NATA, (b) α-chymotrypsinogen A, (c) phosphofructokinase, and (d) phage F1 virus. The slopes of the linear fits were around 3, demonstrating three-photon excitation of these molecules.