AO	Acridine orange
BSA	Bovine serum albumin
CDI	Carbonyl-di-imidazole
CS	Chitosan
CS-SeNP	Chitosan-coated Selenium Nanoparticles
DCM	Dichloromethane
DMEM	Dulbecco’s Modified Eagle Medium
DMSO	Dimethyl sulfoxide
EMEM	Eagle’s Minimum Essential Medium
FBS	Fetal bovine serum
FSeNP	Functionalized selenium nanoparticle
FTIR	Fourier-transform infrared spectroscopy
HEK293	Human embryonic kidney
HeLa	Human Cervical carcinoma
MWCO	Molecular weight cut-off
NTA	Nanoparticle Tracking Analysis
PBS	Phosphate-buffered saline
PDI	Polydispersity index
PEG	Poly(ethylene) glycol
PEG-CS	polyethylene glycol grafted chitosan
PEG-CS-SeNP	polyethylene glycol-chitosan-Selenium Nanoparticles
ROS	Reactive oxygen species
SD	Standard deviation
Se	Selenium
SH-SY5Y	Neuroblastoma
UV-vis	Ultraviolet-visible
XRD	X-ray diffraction