Fig. 3From: Structural and functional features of self-assembling protein nanoparticles produced in endotoxin-free Escherichia coli Physical properties of protein nanoparticles. a Size of the self-assembled nanoparticles purified in two elution peaks and measured by DLS. b Surface charge distribution of self-assembled nanoparticles measured as zeta potential. Symbols mean significant differences: **p < 0.001; *p < 0.05Back to article page