Fig. 2
Stability of hIGFBP-2249–289 nanotubes. a Fluorescence emission spectra of monomer (red) and nanotube (black). b Fluorescence emission spectra of hIGFBP-2249–289 nanotubes acquired at different temperatures at pH 7.4, inset representing the graph of fluorescence intensities at 20 °C and 90 °C during 10 theromcycles performed. c AFM image of the nanotubes, d line profile used for calculating the averaged diameter