ATP	Adenosine triphosphate
CD27/28/57	Cluster of differentiation 27/28/57
CoQ10	Coenzyme Q10
CSF	Cerebrospinal fluid
CTLA-4	Cytotoxic T-lymphocyte-associated antigen 4
DAMPs	Damage-associated molecular patterns
DNAM-1	DNAX accessory molecule 1
EOMES	Eomesodermin
FAO	Fatty acid oxidation
Gal-9	Galectin-9
HCs	Healthy controls
HIV	Human immunodeficiency virus
IFN-γ	Interferon gamma
IL-2/6/10	Interleukin 2/6/10
KIR	Killer cell immunoglobulin-like receptors
KLRG-1	Killer cell lectin-like receptor G1
LAG-3	Lymphocyte-activation gene 3
MAVS	Mitochondrial antiviral signalling proteins
ME/CFS	Myalgic Encephalomyelitis/Chronic Fatigue Syndrome
mtDNA	Mitochondrial DNA
NF-κB	Nuclear factor kappa B
NK cell	Natural killer cell
NKG2A/D	Natural killer group 2A/D
OXPHOS	Oxidative phosphorylation
PBMCs	Peripheral blood mononuclear cells
PD-1	Programmed cell death protein 1
PEM	Post-exertional malaise
RNS	Reactive nitrogen species
ROS	Reactive oxygen species
SASP	Senescence-associated secretory phenotype
T-bet	T-box expressed in T-cells
TCF-1	T cell factor 1
TIGIT	T-cell immunoreceptor with Ig and ITIM domains
TIM-3	T-cell immunoglobulin and mucin domain 3
TNF-α	Tumour necrosis factor alpha
TORC1	Target of Rapamycin Complex I