NP	Nanoparticles
CP	Commercially Pure
SRXRF	Synchrotron radiation X-ray fluorescence spectroscopy
PLM	Polarized light microscopy
ROS	Reactive oxygen species
SLA	Sandblasted, large grit, acid-etched
TLR	Toll-like receptors
MAPK	Mitogen-activated protein kinase
CNS	Central nervous system
BMP-2	Bone morphogenetic proteins-2