ATF4	Activating transcription factor 4
CHOP	C/EBP homologous protein
eIF2α	eukaryotic initiation factor 2α
ER	Endoplasmic reticulum
ETS	Electron transfer system capacity
GCN2	General control nonderepressible 2 kinase
GRP78	Glucose-regulated protein 78
HRI	Heme-regulated inhibitor
IRE1	Inositol-requiring enzyme 1
ISR	Integrated stress response
OPA1	Optic atrophy 1
PERK	PKR-like ER kinase
PHB	Prohibitin
PKR	Protein kinase R
ROS	Reactive oxygen species
SEM	Standard error of the mean