Figure. 4. The size effect of nanoparticles: A. Large-size
nanoparticles will cause more significant cell membrane deformation,
reproduced from Reference44 with permission from
Copyright © 2016, Springer Nature. B. As the size is smaller than the
optimal size, large-size nanoparticles are more likely to be wrapped by
cell membranes than small-size particles, reproduced from
Reference50 with permission from Copyright © 2014,
Taylor & Francis.