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Biophysical characterization and fluorescence image of fluorescent protein nanoparticles. a) The absorbance and fluorescence emission spectra of fluorescent protein nanoparticles in 1x PBS, pH 7.4. b) Overlay of fluorescence and white light images of fluorescent protein nanoparticles in 1x PBS solution, pH 7.4 (NPs, Left) and 1x PBS, pH 7.4 (Right). Fluorescence imaged with 630 nm excitation and 700 nm long pass filter.
