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(left) Fluorescence spectra (ex: 650 nm) indicating partial dissociation of M2 ⊃ S3-Et (500 nM) in FBS over 1 h (spectra acquired every 3 min). (right) Fluorescence spectra (ex: 650 nm) indicating no dissociation of M2 ⊃ S3-Pr (500 nM) in FBS over 16 h (spectra acquired every 30 min).
